Warren's Plant Mover
These Meetings Are Open to Non-members
American Rhododendron Society Annual
Convention 2000
Western Regional Rhododendron Conference 2000
ABOUT RHODODENDRONS
Rhododendrons Growing in Limestone
Warren's Plant Mover
Rhododendron Planting Tips
Cecil Smith Hybrids
Species Profile: Rhododendron griffithianum Wight 1850
Hawaii Wants New White Vireya to Name
Rhododendron 'Karen Morebeck'
? FAQ: Questions with Answers by Jay Murray
The Maximum Move
Rhododendron 'Sweet September'
Words of Wisdom
Cuttings for Future Plant Sales
By George, We've Got a Flower
Links to Rhododendron Articles and Information
RHODODENDRONS GROWING IN LIMESTONE
Glen Patterson, Vancouver Rhododendron Society
Since the early days of plant exploration in Western China, it has been known that a wide variety of rhododendron species actually survive and do well growing in the limestone mountain ranges ... Yet, in cultivation, it is well known that rhododendrons cannot be grown in alkaline soils. One often hears that "rhododendrons are acid loving plants." Finding the answers to such questions as "Do rhododendrons actually grow in actual contact with limestone soils? and , if so, What is the Secret? was the subject of Professor Rankin's lecture at the recent Rhododendron Species Symposium in Bellevue, Washington.... Professor Rankin is in the Chemistry Department at the University of Edinburgh.. For several years, he and his colleagues, including Mr. Sun Hang of Kunming Institute of Botany have analyzed soils and leaf samples from widespread limestone areas in China. They tested both organic and inorganic content of soils from 60 very different sites. The research concentrated on the ions of calcium, magnesium, iron and manganese and related concentrations to the soil pH and to availability of these minerals to the plants. Many delegates to the conference were astounded to hear that rhododendrons in the wild actually grow right in the limestone, not on the top or in organic layers, as usually understood. The soils were generally found not to be dolomite (which contains up to 50% magnesium), but were pure calcium carbonate. Professor Rankin showed that, contrary to popular opinion, the heavy concentration of calcium in the snowmelt and run-off water actually permeated the organic topsoils. Often this water was saturated with calcium showing pH as high as 8.4. He reported that the heavy summer rains in N. W. Yunnan, rather than washing minerals out of the soil, actually wash them into the topsoil. In their soil analyses results, the study team found that calcium attained very high concentrations in high pH soils, with rhododendrons being healthy and thriving. Magnesium had comparatively low concentrations (less than 1%), even in high pH soils, and therefore, the survival and health of plants could not be attributed to successful competition to calcium by magnesium. Further analysis of iron and manganese showed that there were sufficient quantities available to plants for healthy growth in all the Chinese soils whether acid or alkaline. In rhododendron leaf analysis, some plants appeared to be close to iron deficiency. Manganese was never a problem in the wild areas. Professor Rankin said that rhododendrons grab and store in the leaves all the manganese available and never seem to get too much. It appears that the source of manganese is from the manganese rich leaves when they fall and biodegrade around the roots. Professor Rankin noted that some rhododendron species are much more tolerant of limestone than others. These included: R. primuliflorum, R. telmateium, R. cuneatum, R. vernicosum, R, yunnanense, R. racemosum, R. taliense and R. rubiginosum.
He gave suggestions for growing rhododendrons in high pH soil in cultivation.
This important research will continue with the application of these findings to the growing of rhododendrons in cultivation in the United Kingdom and in high pH soil. For further information refer to The New Plantsman. - Glen Patterson.
Permission to use this article which appeared in the May 1999 Vancouver Rhododendron Society Newsletter was given by Glen Patterson. The current editor, Dorothy Kawaski, has given permission to use materials from Vancouver Rhododendron Society Newsletters.
[Editor: David Rankin article, "Non-conformist Rhododendrons" may be read in the Victoria Society's archived articles. David Rankin's work can be viewed at http://www.ed.ac.uk/chemistry/dwhrankin/.]
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|
Warren's Plant Mover |
| From the West Coast to the East Coast and back again, this design for a practical way to move plants traveled, with a few modifications. The New York Chapter Newsletter noted that Werner Brack (New York Chapter) had seen a special hand truck at Rex and Jeanine Smith's when he visited their garden at the 1999 ARS Convention in the Seattle area. Rex had seen it at Warren Berg's near Point Ludlow, Washington. Werner went home to St. James, New York, modified it and built one himself. It seems that others from that chapter are now building "Warren's Plant Mover." It sounded like a great idea. When asked about it, Warren graciously agreed to share his design with you home gardeners who may need to move big plants. So here is a picture of the actual "Warren's Plant Mover." Photo with measurements by Warren Berg. | |
| [Editor: Readers will note this publication normally has no pictures, a personal preference to avoid long download times for the reader. The Plant Mover seems like such a good, simple and easy idea for gardeners, I thought it warranted showing it to you.] |
Rhododendron Planting Tips
Dick Houghton, Cape Cod chapter
Three Vital Requirements
Site Selection
The simplest general recommendation is for a site with 50% sun/shade as under tall oak's or pines, or on the north side of a building or hedge protected from the drying wind and winter sun. Small-leaved rhodies like more sun than the large-leaved ones, though all blossoms will last longer with some shade.
Site Preparation
The hole need not be deeper than the root ball, but there is no upper limit to the diameter. For small plants we like a minimum width of four times the root ball diameter because, in poor soil, the roots will spread more quickly and the plants will become "established" sooner than if they have to struggle to get their roots out. In hard packed ground it is advisable to anticipate future root growth by using a fork to loosen the soil beyond and in the bottom of the hole.
Soil Preparation
In a wheelbarrow mix the best of the excavated garden soil 50 - 50 with coarse moist peat moss or other organic material to provide aeration and water-retaining qualities. If you are planting in good topsoil, it is not necessary to add peat moss. But in poor soil or sand, use of soil amendments or imported quality topsoil may be called for. A handful of super phosphate may be added, but no other fertilizer should be used at this time. Place one to two inches of the improved soil in the hole.
Planting
First soak the root ball in water for five
minutes. If it is burlap wrapped: Lift the plant by the burlap, never by the stem.
Place the ball on the new soil in the hole. Remove the burlap after untying and carefully
tilting the plant one way and then the other. If the soil has become loose around the
roots, untie and spread out or cut away the burlap or plastic without moving the ball.
If it is from a container: All potted
rhodies need to have their roots freed up. If the roots are wrapped around the root ball,
they must be mutilated to force them to move into the new soil. One way to do this,
drastic as it may seem, is to slice across the bottom, half way up to the top, and then
turn the "ball" 90 degrees and slice again. Then spread the four cut sections
apart to expose the interior of the "ball" to the new soil, which has been
mounded in the center of the hole to match the new shape of the root mass. Less drastic
cutting of the encircling roots is often sufficient.
In either case, the root ball should have been
placed on the layer of prepared soil mix so that the crown, top of the ball or base of the
stem is one to two inches above grade level to allow for settling. By hand, firmly push
the ball down into the mix, and half fill the hole around it with the prepared soil.
Again, by hand, press the soil down around the root ball. We do this by poking with
fingers extended. Do not use your feet, as this is likely to reduce aeration.
After filling the hole with water and letting
it drain through the-new soil, fill the remainder of the hole with soil mix. Then build a
raised water-retaining dike around the planting and water again.
After Care
Mulching the area within the dike or out to the leaf drip edge with an acidic material such as pine needles, oak leaves, or pine bark will keep the roots cooler, conserve moisture, control weeds, and reduce winter temperature fluctuations. Most experts advise against placing the mulch right up to the stem.
ALL RHODODENDRONS NEED A CONSTANTLY MOIST SOIL AND MAY NEED WATERING DURING DROUGHTS, BUT THOSE NEWLY PLANTED WILL LIKELY NEED EXTRA WATERING BECAUSE OF ROOTS LOST OR DAMAGED IN THE PLANTING PROCESS.
These planting tips were prepared by Dick Houghton in September 1999. They are based on his own experience plus advice offered by a number of experts. We have tried to keep these instructions simple and brief, and they are tailored for the typical sandy Cape Cod site; for heavy clay or for alkaline soils, procedures would differ. Many gardeners will also be interested in the reasons for these recommendations.
Mr. Richard Houghton, Cape Cod Chapter, gave permission to use these materials. They appeared in the Cape Cod Newsletter, October 1999.
RETURN to TOP of PAGECecil Smith Hybrids
The Cecil and Molly Smith Garden Committee would like to obtain information from anyone who is growing Cecil Smith hybrids. Some rhododendron enthusiasts from the Longview, Washington area have been growing some of his hybrids for many years and are sharing their experiences and successes with the Garden Committee. The committee plans to use these to make a special memorial to Cecil and his work but they want more input. The Smith Garden committee is seeking information about Cecil's hybrids, photos, correspondence, anecdotes and any other materials etc. regarding Cecil Smith. They are especially interested in hearing from people who had purchased his ARS seed. They encourage those who have grown plants from Cecil's hybrid seed to write to the committee. Through the years Cecil Smith contributed much seed and pollen to ARS members through the ARS Seed Exchange. Some of those plants must still be growing throughout the rhododendron world. If you have plants grown from any of his seed, please let the committee know where they are. Also, if anyone has saved correspondence from Cecil or photos, they would appreciate your sharing that with the Smith Garden archives, even if it's only a copy. You might like to write about an anecdote or experience with the Smiths. Time goes on and these things can be forgotten. All of these will be compiled for a memorial to Cecil. Please help to make it a very special memorial. Send anything you might have to:
Fran and Ed Egan
14635 SW Bull Mt. Road
Tigard, OR 97224
If you prefer, you can write the committee by email to bettyspady@aol.com.
RETURN to TOP of PAGESpecies Profile: Rhododendron griffithianum Wight 1850
STEVE HOOTMAN AND JACK ROOT
Of all the hundreds of Rhododendron species introduced into cultivation over the past 150 years, it may be argued that none has had greater influence than Rhododendron griffithianum. Immediately after this magnificent species first flowered in England in 1858, it was extensively used in hybridizing. The genetic heritage of many of the most popular hybrids grown today can be traced directly to the early introductions of this outstanding plant.
Dating, from Hooker's fieldwork, many 'rhodophiles' have admired R. griffithianum, which exhibits exceptional beauty and other ornamental qualities. The popularity of this tender species as a garden plant and parent is quite understandable, as one would be hardpressed to surpass it in quality, character and commercial influence.
The incredibly lush and magnificent flowers-which range from white to deep blush-are often fragrant and may be upwards of three inches long by six inches wide. These flowers, when combined with attractive dark green foliage and smooth exfoliating reddish or multihued bark, provide one of the most spectacular displays in the entire genus.
Historical Introduction
In 1849, Joseph Hooker described this species in The Rhododendrons of Sikkim Himalaya and introduced it into western cultivation from his famous three-year expedition to Sikkim. Unaware of the earlier work by William Griffith and Robert Wight, Hooker named his introduction R. Auckland after his friend and patron the Earl of Auckland, former First Lord of the Admiralty and Governor-General of India.
In 1850, R. griffithianum attracted the attention of British botanists when Wight, superintendent of the Madras Botanic Garden, described and named it after Griffith, former superintendent of the Calcutta Botanic Garden who died in 1845. Wight's studies were based on Griffith's herbarium specimens collected ca. 1835 in Bhutan.
Peter Cox notes that R. griffithianum was Frank Kingdon-Ward's favorite Rhododendron species in the wild. To quote Kingdon-Ward, "There is an ethereal quality about the enormous bell flowers-their vital milk whiteness, their careless rapture of form, their exquisite effortless grace as they hang clustered from the leafy shoots, their subtle fragrance -which defies description." The dilemma faced by gardeners wishing to cultivate this species is appropriately described by Henry Ewbank, an enthusiastic admirer of the genus, who called it, "The glory of the Himalayas and the Queen of all flowering shrubs." However, Ewbank acknowledged that this species was badly "crippled" even in the temperate climate of the Isle of Wight. [Street 1965, Millais 1917]
Steve's Observations in Sikkim
Following Hooker's introduction, R. griffithianum has been collected many times and from different locations. It occurs from 6,000 to 9,500 feet in the Himalayas from eastern Nepal through Sikkim, Bhutan, and adjacent areas of northeastern India. Commonly found in forests, this species is abundant in certain locations but is considered rare throughout much of its range.
During an expedition to Sikkim in the spring of 1997, Mr. Hootman observed R. griffithianum in three widely separated locations. It grew in mixed forests of broad-leaved evergreen and deciduous trees and was typically associated with R. grande and R. lindleyi. In the two populations he found in bloom, the flowers did not vary greatly in size or color. Most fell into the larger end of the spectrum and were white or white flushed with pink.
Botanical Description of Rhododendron griffithianum
While R. griffithianum is a member of subsection Fortunea, it is morphologically distinct from any other member of that group -RR. decorum, fortunei, orbiculare, vernicosum, and calophytum, for example. The primary differences distinguishing this species include its large calyx, exceptionally large five-lobed corolla, and extremely disjunct range. Some authorities believe that R. griffithianum should be placed in its own subsection.
In the wild, R. griffithianum grows as a large spreading to upright shrub or small tree, attaining heights ranging to 50 feet. The bark is smooth and peeling, typically reddish in color, but varying to tan, gray, brownish or an attractive combination of these hues.
The dark green foliage is smooth on both surfaces and up to twelve inches long by four inches wide. The leaves vary in shape from oblong to somewhat elliptic or oblong-ovate with a rounded base. In late spring, as the bright green new leaves emerge, they are adorned with long reddish leaf bracts for an added burst of color.
The flowers (mid to late spring) are borne on a long rachis in an inflorescence containing three to six flowers. The individual flowers are among the largest in the genus, often attaining three inches in length by six inches in diameter. They are broadly bellshaped, often fragrant, and range in color from pure white to white flushed with rose, pink or yellow, sometimes with a green throat and/or spots.
Cultivation of R. griffithianum
In cultivation, R. griffithianum is hardy from 10° F to 15° F (-9° C to -12° C). It is only suitable as a garden plant in temperate areas such as New Zealand, southern England (Cornwall), the western coasts of Scotland and Ireland, coastal California and Oregon, and other regions with similarly mild climates. Growers in the Pacific Northwest have flowered R. griffithianum in the open air at Vancouver Island, Canada, Olympic Peninsula, Washington, and Waldport, Oregon. Where this species is hardy, it performs best in a sheltered position with protection from the afternoon sun. In harsher climates, R. griffithianum makes a superb specimen for the cool greenhouse and -with its attractive bark and flowers-an excellent plant for container gardening.
An outstanding specimen of R. griffithianum has survived for more than 30 years in Nick and Evelyn Weesjes' collection at southeastern Vancouver Island. The Weesjes propagated it from a cutting obtained from England during the mid-1960s. Its flowers reach six inches in diameter- suggesting Sikkimese ancestry-and it has survived cold snaps to 5° F (-15° C) without damage. The large size and compactness of the trusses are also exceptional (see photograph in Cox 1997). Located near Deep Cove and Towner Bay on the Saanich Peninsula, the Weesjes' garden enjoys a temperate, sheltered location surrounded by Haro Strait and the Saanich Inlet.
In 1988, Warren Berg collected R. griffithianum seed from Bhutan. [Berg 1989, Cox 1989] His garden on the Toandos Peninsula (northeastern Olympic Peninsula) includes an excellent specimen that flowered for the first time in 1998. The blossoms are white, fragrant and several inches in diameter. The bracts and new growth are intense red. Surrounded on three sides by Dabob Bay and the Hood Canal, Mr. Berg's garden enjoys one of the mildest climates available on the peninsula.
June Sinclair raised several 5-year-old plants from Mr. Berg's wild-collected Bhutanese seed. Although none has flowered yet, her plants have survived in the open air following severe winter storms. Located adjacent to Hood Head Inlet near Port Ludlow and the Hood Canal Bridge, Ms. Sinclair's garden is surrounded on three sides by water. Several years ago, she obtained a 7-year-old specimen plant of R. griffithianum grown from seed collected wild in Sikkim by Britt Smith. During its early life, Mr. Smith maintained this plant in his greenhouse. Soon after Ms. Sinclair moved it outdoors, it succumbed to a severe cold snap. --Steve Hootman and Jack Root.
References
Steve Hootman is curator and co-executive director of the Rhododendron Species Foundation. He is a frequent writer of articles to the RSF Newsletter and Journal American Rhododendron Society and has lectured to garden clubs, civic groups, conventions and ARS meetings. He has made several plant-hunting expeditions.
Jack Root is a retired professor from the University of California. He has written technical publications and edited books and journals. He is co-owner of Sylvan Gardens, which cultivates historic rhododendrons and sponsors research. He serves on the RSF Board of Directors.
This article was published in the Rhododendron Species Foundation Special Convention Issue, May 1999 on its 35th Anniversary. Permission has been granted from Steve Hootman and Rick Peterson, Co-Executive Directors at the Rhododendron Species Foundation, to reprint materials from RSF publications. Dr. Root, the new RSF Newsletter Editor and co-author of the article, has also given permission to use this material.
RETURN to TOP of PAGEHawaii Wants New White Vireya to Name
Hawaii Chapter is trying to stimulate interest in someone making a cross of white Vireyas that could be named for the new white Tiger at the Panaewa Rainforest Zoo where the chapter has a display section. The chapter sponsors a section of the Panaewa Rainforest Zoo, which is becoming a world-class rain forest botanical garden. "Mitch" Mitchell is the chapter president. Read more about that project and the Hawaii Chapter in "Coming Out Party" in the Gardens and Arboreta Section.
Rhododendron 'Karen Morebeck'
Strybing Arboretum in San Francisco, California honored Karen Morebeck, who died last winter, by naming the best of the new Strybing Nursery's vireya hybrids after Karen. Rhododendron 'Karen Morebeck,' which Karen nurtured for many years, will be available to the public in the near future. A memorial fund was also establish in her honor to pay for the new display signage in the vireya garden, which will become part of the future Old World Cloud Forest. Karen, an active member of California Chapter and the chapter newsletter editor for several years, gave years of service as a volunteer at the Strybing Nursery. After a devastating freeze in 1990, it was Karen who went to friends and growers and reacquired nearly all of the vireya rhododendron varieties that had been lost. Vireyas are treasured because of their waxy-textured flowers that are vividly colored in hues of yellow, orange, salmon pink, maroon and red. They come from semitropical Asia but grow well in the more protected parts of the Bay Area. The value of Strybing's vireya collection is a tribute to Karen Morebeck's hard work. From California Chapter newsletter, "Cal Chapter News," September 1999.
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Princeton Chapter's Jay Murray, the ARS Plant Registrar, has a column in the Princeton Chapter Newsletter called "? FAQ" in which she answers frequently asked questions about rhododendrons. The October 1999 newsletter question was:
?
FAQ: How can I identify the edition of my RHS Colour Chart? Where can I purchase the RHS Color?Jay Murray, ARS Plant Registrar answers:
The three editions of the Colour Chart are packaged differently. The 1966 edition is in a
dark green, heavy cardboard box with a lift-off top; the 1986 is in a silvery gray,
plastic box with a flip-up top; and the 1995 is in a dark green, plastic box with a
flip-up top.
The RHS Colour Chart is available from:
RHS Enterprises Ltd
RHS Gardens
Wisley, Woking
Surrey GU23 6QB
ENGLAND
Telephone: 01483 211320
E-mail: mailorder@rhs.org.uk
You may pay by credit card (Visa, MasterCard, American Express) or check denominated in pounds sterling. The current price is £100 (pounds sterling), and surface shipping is £22. The exchange rate is usually around $1.60US per £1UK. - Jay Murray
This "?FAQ Column" by Jay Murray is seen in the Princeton Chapter Newsletter. The above question/answer appeared in the October 1999 copy. Permission to use materials from this questions/answers column was given by Jay Murray.
RETURN to TOP of PAGEThe Maximum Move
In May, the Atlantic Rhododendron Society, a chapter of the American Rhododendron Society, undertook what may have been the largest rhododendron move in Atlantic Canada. The plant was a 16' high x 16' wide Rhododendron maximum donated by Ms. Debbie Denoon who inherited the plant when she purchased her home. Realizing it had outgrown its home but reluctant to cut it down, she contacted the chapter.
Roland's Flora of Nova Scotia reports the species was discovered in Nova Scotia near Sheet Harbour in the late 1800's. For this reason it was decided the home for this plant should be the Nova Scotia Museum of Natural History. The move went smoothly and was remarkably easy. The plant looked spectacular. You may see pictures and read about this move in the Chapter Website.
Seen in the 'Atlantic Newsletter,' October 1999. Permission to use materials from the chapter's newsletters granted by the editor, Tom Waters.
Rhododendron 'Sweet September'
Rhododendron 'Sweet September', a lovely medium pink deciduous azalea, usually blooms in August. This late blooming R. prunifolium was a surprise for Brian and Cathy Keim last September. Thinking the blossoms were "fried" from the drought, they were delighted when the plant was covered with fiery scarlet blooms after Labor Day. Did others experience delayed blooming? Cathy, who is editor of the Greater Philadelphia Chapter Newsletter, commented "What a treat!" And, of course, it was a pleasant surprise.
RETURN to TOP of PAGEWords of Wisdom
Words of Wisdom from ARS President Lynn Watts was seen in the October 1999 North Island Rhododendron Society Newsletter but came from an earlier Seattle Chapter's newsletter, Rhodoland. Lynn said "Cedars and large maple trees have very invasive root systems that rob rhododendrons of moisture and nutrients. Douglas firs generally have dense and umbrella-like canopies that prevent rain from moistening the ground directly underneath. Low ground covers that have invasive, nutrient-robbing root systems include 'St. John's Wort' (Hypericum), Vinca major and V. minor, ajuga, Creeping Charlie and ivies. Plants used successfully with rhododendrons include all forms of Gaultheria, Cornus canadensis, wild ginger, Primula, Epimedium, Mahonia, most ferns and all bulbs, including Trillium, Cyclamen and lilies."
Cuttings for Future Plant Sales: Victoria Rhododendron Society, a chapter of the American Rhododendron Society, has a Propagator's Group who take special cuttings from several gardens and propagate them for future plant sales at chapter meetings.
RETURN to TOP of PAGEBy George, We've Got a Flower
Sammamish resident picks new city's name for new rhododendron.
Story by Dave Herman
Sammamish Review, August 4, 1999
Sammamish hasn't adopted an official city
flower, but a newly registered flower bears its name. Sammamish resident Bob George
received word last month that a rhododendron he raised over the past seven years has been
registered internationally by the Royal Horticultural Society of England. George named the
flower, Rhododendron 'Sammamish.'
"I thought it would be a nice thing to do
for the new city," said the 67-year-old George, whose Beaver Lake-area home includes
one of the area's top private rhododendron gardens. The flower's characteristics include
its shrimp-pink color, conical shape and twenty-four flowers in each truss. "It's not
rare," George explained of the large number of florets, "but it is something to
strive for in hybridization."
He further described R. 'Sammamish' as a
good healthy plant that rarely loses its leaves, as opposed to many other plants that do
so each year. Rhododendron 'Sammamish' is recognized by the American Rhododendron
Society, as well as the Royal Horticultural Society.
George brought the seeds back from New Zealand
in 1992. The identity of the parent plants is unknown. After years of care, the plants
first bloomed in the spring of 1996. The 'Sammamish' flower was unique among 200 other
plants from the New Zealand seeds. After its bloom held true for the past four springs,
the plant was ready to be registered.
George originally referred to the flower as
'Strawberries and Cream' before a better name presented itself. A collector of
rhododendrons since 1970, he hadn't registered a new hybrid until now. "Since we are
creating a new city up here, I thought I would register it and give it the name of the new
city," George said.
The plant, nestled among the extensive
rhododendron collection in the back yard of Bob and his wife, Coleen, has grown to about
two and a half feet tall. It produces blooms about 9 inches across by 9 inches high in
mid-April.
George, founder and past president of the
American Rhododendron Society's Cascade Chapter, said he would see if there is interest in
reproducing the flower. There are several methods of doing so, but it would take some
time. "You would have to grow a number of cuttings and, from these, other cuttings
would be made until enough plants were available for marketing," George said. "I
think it is worthwhile to do. But it is not a very quick process."
Permission to reprint was received from Editor Dave Herman of the Sammamish Review, a subset of the Issaquah Press in Washington State. Minor corrections have been made by Bob and Coleen George at the request of Mr. Herman.
RETURN to TOP of PAGE| Links to past issues of Rhododendron and Azalea News About Rhododendrons Sections: | |
| January
1998 March 1998 June 1998 September 1998 |
December
1998 March 1999 June 1999 September 1999 |
Links to Useful Rhododendron Articles and Information Websites
Connect and Read These Articles about Rhododendrons and Azaleas.
The following articles and information can be found on these Websites:
"A
Brief Study in Seedling Growth" by Al Muller
ARS
Registration of Rhododendron Plant Names by Jay Murray
Azaleas
and Rhododendrons in the Landscape from Ohio State University
"Beginners'
Tips" by Doug Irish-Hosler
Beneficial
Insects from Virginia Cooperative Extension
"Deadheading"
by Alec McCarter
Description
of R. canescens from U. of Delaware
Description
of R. prunifolium from U. of Delaware
Description
of R. schlippenbachii from U. of Delaware
Description
of Rhododendron minus from U. of Delaware
"Digging
and Transplanting Rhododendrons"
"Growing
Rhododendrons Up North" by Lee Hughes
"Growing
Rhododendrons in Niagara Falls, Ontario Area"
"How to Grow
Rhododendrons and Azaleas" by Steve Henning
"How
to Grow Rhododendrons from Seed"
"Insect
Pests of Ornamental Plants Slide Show" from Virginia Cooperative Extension
"Insect and Related Pests
of Flowers and Foliage Plants" from North Carolina State University
"Insects and Related
Pests of Shrubs" from North Carolina State Extension Bulletin AG 189
Our best azaleas (Dawes Arboretum)
Our best rhododendrons (Dawes Arboretum)
New Kurume Hybrids: by
David Sauer
North Carolina State Plant Propagation Sites
Leaf, Cane and Root
Layering
Stem Cuttings
Seeds
Overcoming Seed
Dormancy
"Petal
Blight" by Dr. Dave Lewis
"Planting
Instructions" by James Fry
"Plant
Portrait of Rhododendron fortunei" by Dr. Nancy Traill
"Propagation
in a Plastic Tent"
"Pruning"
by Henry Helm
"Raising
Rhododendrons from Seed" by Don Hyatt
"Rhododendron
ABC's" by Dr. David Goheen
"Rhododendron
and Azalea Planting Instructions" information from Joe Minahan
"Rhododendron Culture"
by Robert McKenzie
"Rhododendron
Culture on Whidbey Island" by Bill Stipe
"Rhododendrons
from Seed" by John Weagle
"Root
Weevil"
"Tips on Growing
Rhododendrons in Newfoundland"
"Rhododendron Problems" Washington
State University
"Transplanting
Container Grown Plants" by Ed Reily
"Three
Aspects of Hardiness" by Dr. Herbert Spady
"Vireya
Cultivation" by Chris Callard
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Your comments are welcome. Send your ideas to bettyspady@aol.com.
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