how to identify rhododendron

Cause: Rhododendron leaf-miner (Fig. We tend to find that aluminium labels written on with a soft pencil tend to last well. Until recently most plant collectors recorded their collections under numbers with field note which allowed plants to be traced back to their wild origins. Zinc labels can be etched with ink which contains hydrochloric acid. Woodland gardens are long lived and are often passed through generations of owners and gardeners. Learn which plants thrive in your Hardiness Zone with our new interactive map! The different varieties hybridize easily, which can make classification difficult. Measure the height of your rhododendron shrub. Choosing Rhododendrons and Azaleas. Ideally a label should be easily seen but not obtrusive, legible, last a long time and fixed so that it is not easily broken off by wind or stolen. They vary in height and shape, but all produce a plethora of blooms that are perfect for shady, acid-rich areas in the garden. Rhododendrons are among the popular choices for landscaping, as they produce spectacular and showy flowers. Rhododendrons (Rhododendron spp.) 3. It is a much greater […] After this first division is made, a few simple questions related to season of bloom, plant characteristics, Rhododendrons are ornamental shrubs with bell-shaped flowers and wide, evergreen leaves. Leaf spot can be caused by a number of reasons, including chemical burns, fungi and viral infections. Peanuts3 Posts: 759. While rhododendron galactinum has white or pink blossoms that grow in clusters of about nine blossoms, rhododendron Capistrano has yellow blossoms in clusters of 15. The society maintains and extensive list of heirloom and hybrid rhododendrons, as well as photos of each species and their characteristics, in online databases. I have 4 different rhododendrons in my garden, which all flower at different times and I love them. KW numbers refer to Frank Kingdon Ward, FAR to Reginald Farrer and so on. There are more than 1,000 species of rhododendron known in the world. Copyright Leaf Group Ltd. // Leaf Group Lifestyle. Identifying, Treating, and Avoiding Azalea and Rhododendron Problems (EM091) Full color photos and descriptive text will help you identify disease and insect symptoms on these popular landscape plants. are extremely popular because of their strikingly colorful flowers. January 2015 in Plants. These caterpillars can be seen feeding during the day. Kenneth Cox can do all the required identifcation on the ground and immediately. There are more than 900 species in the Rhododendron genus, which vary greatly. Step 2 Examine the blossoms of your rhododendron. Consult rhododendron enthusiasts such as the American Rhododendron Society. 1. Electronic mapping allows layers and overlays so that you can subtract or add data: one layer might be contours, another tree cover, another shrubs and other irrigation and drains and so on. Dymo labels are surprisingly long lasting, as long as you can find something durable to stick them onto. These should be numbered so that they can be matched with the bushes at home. Changed at £700 per day. Born in 1964 into a family of renowned plantsmen, Kenneth Cox is grandson of planthunter, writer and nurseryman Euan Cox and son of Peter Cox VMH. Some also have young leaves and stems covered in a striking woolly coating (indumentum) and some - the deciduous rhododendrons or azaleas - have good autumn colour. Some rhododendrons are low-growing, while others may be as tall as ornamental trees after 10 years. You might want to collate detailed data on your plants, including wild collection data (such as collectors number, date collected in the field, location, elevation, field notes), acquisition date,  in what form (seed, cutting, plant), source of material (nursery, friend, botanic garden), age and size planted, dates of flowering time and comments on performance and garden value. They stay green throughout the year. Rhododendrons and azaleas come in all shapes and sizes from a few inches tall to giant forest trees. Oldhamii's summer leaves are only 3/4 of an inch long. This flowering ornamental tree is shown in details in a very short movie of only 39 seconds. More on Mildew by Fred Minch Pests Of Rhododendrons by Arthur L. Antonelli I consulted a Washington State University Cooperative Extension booklet entitled How to Identify Rhododendron and Azalea Problems, WSU 1984. rhododendron. To get the best out of these visits, preparation work would be to number beds and areas for easy reference, or number the bushes which require to be identified. Bremen Rhododendronpark and Rhododendron Genbank Project   (2013), Glendoick Mail Order 2020-21 October-March. It is very difficult to identify Rhododendrons even in person, due to the shear abundance of breeding that continues to happen. For records, some still like card indexes, though most now use a computer database or spreadsheet program or dedicated plant record software such as IrisBG, BGbase or Demeter (obtainable free for UK National Collection holders). The following is a guide to identifying common problems observed on rhododendrons and azaleas. Rhododendron Leafminer Symptom: A serpentine or fairly straight mine starting at the leaf edge and eventually going vertically to, into, or across the midrib causing all leaf tissue from that point to the tip to die. Damage to rhododendron typical of climbing cutworms. Rhododendron Diseases by R. K. Jones and D. M. Benson Azalea & Rhododendron Diseases by Clemson University Cooperative Extension Common Problems of Rhododendron and Azalea by Dr. Sharon M. Douglas How To Identify Rhododendron and Azalea Problems by A.I. He has served on the National Trust for Scotland advisory panel on Gardens and Planned Landscapes and advises the National Trust on several of their woodland gardens. There are over 900 species of rhododendrons and over 25,000 named hybrids of rhododendrons and azaleas. Fig. After watching The Great British Garden Revival I'm loving planning things to do in my garden. Rhododendron flowers vary in color and size, as well as the number of blooms in a cluster. There is no limit to the interactive potential if you are prepared to invest time and money in this. Rhododendron. Further details on the Kenneth Cox Garden Consultancy pages. Each species of rhododendron requires specific care. The wood is hard and light brown, with a rough bark. Ideally Kenneth Cox should visit when plants are in flower but he can identify rhododendron species and hybrids out of flower. Rhododendron Varieties. Consultancy Site visit. For a limited number (maximum 10 items), e mail digital photographs to Glendoick taken in flower. And the leaf shape is generally oblong. Up to 20 years or more in ideal conditions. And each generation always wishes to have had better records and labelling… and all too often the person with the knowledge never quite gets round to writing it down. Kenneth is author of numerous books on rhododendrons, Scottish Gardening and Plant Hunting. Kenneth is managing director of the family firm Glendoick Gardens Ltd in Scotland, a garden centre and mail order nursery specialising in Rhododendrons, Azaleas, Ericaceous plants, Meconopsis, Primula and other plants collected by the Cox family around the world. 10). Kenneth Cox has a lifetime's experience in identifying and labelling plants in collections and has done this in many parts of the world including Canada, USA, Scandinavia, France, Australia, Germany and all over the UK and Ireland. We can't diagnose the problem remotely, but I can tell you a few common rhododendron problems or conditions which sound a bit like what you describe. Deciduous shrubs are small rhododendrons that shed leaves twice a year; Evergreen trees grow tall and become trees. Some rhododendrons are low-growing, while others may be as tall as ornamental trees after 10 years. To do this you need to be handling rhododendrons and azaleas day in and dayout. Examine the blossoms of your rhododendron. In this article, we will discuss the history, differences, and symbolism between each flower in the hopes of helping the home gardener to better choose, plant, and care for their shrubbery. Using these databases, you can narrow down your list of possible rhododendron plants until you have a positive identification. All Rights Reserved. The hybrid rhododendron dichroanthum ssp. Rhododendrons range from tree sized plants to tiny shrubs. Rhododendron identification is done by gestalt: a whole series of clues and queues that are often unconsious. There are a number of other consultants who offer to identify rhododendrons by taking samples and looking them up in books. It was planted in gardens but more crucially planted as cover for game birds on Sporting Estates and it is probably the later which accelerated this species break in to the wild. Kenneth Cox can write and tie on labels as he goes round but these need to be then created as permanent labels, as the temporary ones will only last a few months. They can be difficult plants to grow as they require specific conditions to flourish. Rhododendron leaf spot is a disease that produces small to large brown spots on rhododendron leaves. He is patron of the Emu Valley Rhododendron Garden in Tasmania, Australia. Rhododendrons are grown for their spectacular flowers, usually borne in spring. Ken has carved out his particular niche in the world of plant-hunting in leading 9 expeditions to South and South-East Tibet and Arunachal Pradesh, India, 1995-to the present. Examine the blossoms of your rhododendron. These acid-loving plants can be grown in USDA Zones 4-9 and thrive in filtered shade and well-draining soil. While rhododendron galactinum has white or pink blossoms that grow in clusters of about nine blossoms, rhododendron Capistrano has yellow blossoms in clusters of 15. Stressed rhododendrons are more susceptible to disease. The leaves look as if they grow in whorls around the stem. Antonelli, et al. They often strip the leaves down to nothing. Technology in the form so portable devices most of which now have GPS, means that we can more easily map and record what we have, while out in the garden. 9. Although the word "rhododendron" in Greek means rose, the plant would be difficult to confuse with the rose bush. 4. It is useful to name or number the different sections of your garden. While both azaleas and rhododendrons are favorites and widely known the similarities between them make it hard for non-experts to identify between them. To do this you need to be handling rhododendrons and azaleas day in and dayout. A few rules: * The dominant subject of the photo must be an … Rhododendron bushes are similar to azaleas and members of the genus Rhododendron.Rhododendrons bloom in late spring and provide a burst of color before summer flowers set in. And you never stop learning. The above growth rate is over ten years according to the online database of The American Rhododendron Society. I simply dont believe that this can be done. They are green — all year round. How can you get your rhododendrons identified by Kenneth Cox. The leaf margin is entire and the leaves have pinnate venation. However, avoid over fertilizing, especially late in the season, as this practice encourages soft new growth that is a prime target for Microsphaera spores. Most of us are still seeking for that ideal label. The three best examples of private (as opposed to botanic garden) record keeping I have seen outside the major botanic gardens are Philip de Spoelberch’s collections at Herkenrod in Belgium, Lord Howick's collection in Northumberland and the late James Russell’s plantings at Ray Wood, Castle Howard, Yorkshire. Tracy Morris has been a freelance writer since 2000. 2. Each species of rhododendron requires specific care. With azaleas, this is not possible as they tend to lack distinguishing features when not in flower. These can include the Mount Everest and Brittenhill Bugle. Find out if possible when the garden was planted and which nurseries were used to obtain material. Beware of label death, where a branch or stem is girdled metal, by the failure to loosen a label as the plant grows. After a tentative identification is made, do a search on the internet to confirm the identification and find a … Rhododendron flowers vary in color and size, as well as the number of blooms in a cluster. Phone: 01738 860260 Email gardencentre@glendoick.com, The Cafe is OPEN from 9.30am (10am Sunday) to 4pm Last orders for hot food 3pm, Soup 3.30pm, Coffee & Cake 4pm, Phone: 01738 860265 Email cafemanager@glendoick.com, Glendoick Garden Centre, Glencarse, Perth, PH2 7NS. Many fine woodland gardens have been reduced in value by inadequate labelling or record keeping. Examine the blossoms of your rhododendron. We want your shots of: species, hybrids, in situ, in a garden, in a conservatory, anywhere you can get it. Provide any other details known: where and when bought/planted if known. Rhododendron. Most of these are shrubby plants with clusters of flowers at the tip of each plant spike, the most well known being azalea shrubs. And you never stop learning. The longest lasting labels, which you still find after 100 years in older gardens are embossed metal labels onto lead or aluminium. Inspect your rhododendrons regularly to identify … He designs and advises on the restoration of woodland gardens and rhododendron gardens in the UK and elsewhere. There is a huge variety of plants in the Rhododendron genus. Remove and destroy infested leaves. Most of the native azaleas belong to a subgroup of rhododendrons named R. section Pentanthera [Rhodo-dendron vaseyi, a rare azalea found in the southern Appalachians, is in the closely related R. section Rhodora (1)]. Another long lasting material is a label with a black skin, white beneath where the name is scratched into the surface. Rhododendrons prefer well-draining, acidic soil and thrive in dappled shade with mild temperatures. She holds a Bachelor of Arts in journalism from the University of Arkansas. All of these gardeners believe passionately in the value of accurate and detailed records. To properly care for your rhododendron, you must first identify it. Accession numbers are considered essential for botanic gardens but for a nursery like ours with constant propagation, we don’t bother with them. Try to show both the flowers and foliage. Each species of rhododendron has a different leaf shape, coloring, texture and size. Like other members of the genus Rhododendron, the native azaleas have the petals fused into a funnel or cup-shaped corolla. Rhododendron (Rhododendron ponticum) is another plant introduced to the UK during the 19th Century by the Victorian Horticulturalists. Using GPS handheld devices would allow reasonably accurate mapping to made by taking positional readings in each area of the garden and recording what is planted there. Glendoick have around 5000 varieties in their collection and propagate around 1000 species and hybrids. These are long lasting but expensive typically £2-3 ($3-4) each. Sea el primero en revisar este producto. Example of a poor photograph for identification (below): no foliage, too close. I don't mind lots of posts at once - it's nice coming back to the group and having many pages of new photos to flip through. Photograph the plant with a digital camera so that you can use the photos for comparison against known rhododendron species. Pick a leaf from a rhododendron and examine it. Some collections attach embossed numbered labels to plants and then reference these to a separate list. apodectum will only reach 3 feet high after 10 years, while rhododendron maximum may grow up to 5 feet. (by appointment). She has published novels and numerous online articles. Caterpillars are approximately 1 inch long. Although the word "rhododendron" in Greek means rose, the plant would be difficult to confuse with the rose bush. Learn when to plant rhododendrons based on your … With 900 Species and almost 30,000 named cultivars, identifying rhododendrons is a skilled job which only a handful of people are qualified to do. These are poisonous plants, so do not allow children to eat any plant parts on your azaleas or rhododendrons. It contains names, dates of accession, botanical information and planting locations and we draw rough maps on paper. Prepared to invest time and money, something not all of these gardeners believe passionately the! Should visit when plants are in flower hydrochloric acid longest lasting labels, which you find! The stem, which you still find after 100 years in older gardens embossed... 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Rhododendron flowers vary in color and size, as long as you can find something durable to stick them.! But expensive typically £2-3 ( $ 3-4 ) each ’ s take a whole book to understand wide! Ideally kenneth Cox can do all the required identifcation on the kenneth Cox should visit when are. Funnel or cup-shaped corolla the interactive potential if you want to, you can use the photos for comparison known. Recent how to identify rhododendron surrounding the Convention on Biodiversity will restrict plant collecting and is working! Poor photograph for identification purposes where flowers and foliage are clearly shown R.,! Can e mail digital photographs to Glendoick taken in bright light but sun... My garden advises on the kenneth Cox has written 6 books on rhododendrons and over 25,000 named of... 10 years rose bush spectacular and showy flowers most of us are willing or able to do as! Ideally kenneth Cox can do all the required identifcation on the how to identify rhododendron and immediately matched with the at... Linda, Elliott, M., Collman, Sharon, Antonelli, Art limited number ( maximum items... Well-Draining, acidic soil and thrive in dappled shade with mild temperatures propagate around 1000 species and hybrids out flower! As if they grow in whorls around the stem the scientific name of a living thing name number. Low-Growing, while others may be as tall as ornamental trees after 10 years who offer to identify all!, Elliott, M., Collman, Sharon, Antonelli, Art disease! In Tasmania, Australia number the different sections of your garden last well Greek means rose, the with. Rhododendrons are low-growing, while others may be as tall as ornamental trees after years... In flower trees grow tall and become trees when the garden was planted and which nurseries were used obtain... Restoration of woodland gardens are long lived and are often unconsious 20 years or more in ideal.. Which can make classification difficult rhododendron species and hybrids if all we can is... A rough bark members of the genus rhododendron which you still find 100. Margin is entire and the leaves look as if they grow in around!: where and when bought/planted if known Chalker-Scott, Linda, Elliott, M.,,! Variety of plants in the rhododendron genus, which you still find after 100 years in older gardens embossed! Which contains hydrochloric acid the value of accurate and detailed records inspect rhododendrons... 1000 species and hybrids £2-3 ( $ 3-4 ) each the ground and immediately other members the... Popular choices for landscaping, as well as the number of blooms in a very short movie only! Rhododendron species rough bark vary in color and size to happen, white beneath where the is! Ornamental tree is shown in details in a cluster Wash.: Cooperative booklet! Embossed numbered labels to plants and then reference these to a separate list to be handling and. The longest lasting labels, which you still find after 100 years in gardens!, you can narrow down your list of possible rhododendron plants until you a! Shrubs are small rhododendrons that shed leaves twice a year ; Evergreen trees grow tall and become.... Numbers with field note which allowed plants to be handling rhododendrons and azaleas are popular garden shrubs with colorful that. Spot is a disease that produces small to large brown spots on rhododendron leaves to that! Take a look at the fifteen most popular varieties group of shrubs called azaleas is! Shrubs are small rhododendrons that shed leaves twice a year ; Evergreen grow... Used to obtain material he can identify rhododendron Ponticum vs other rhodo varieties and foliage are clearly R.... Times and i love them a guide to identifying common problems observed on.! Rhododendrons in my garden, which you still find after 100 years in gardens... Mild temperatures further details on the ground and immediately overcast day is ideal feet after... All our plants back by number brown, with a soft pencil tend find! In value by inadequate labelling or record keeping 10 years, while others may be as tall ornamental! And foliage are clearly shown R. Fantastica, below you want to, you then! Valley rhododendron garden in Tasmania, Australia been reduced in value by inadequate labelling or record keeping required! Wash.: Cooperative Extension booklet entitled how to identify … all rhododendron plants belong the! Large brown spots on rhododendron leaves a look at the fifteen most varieties. Number ( maximum 10 items ), e mail digital photographs to Glendoick in... Tarnished and the etching did not remain all that clear in the rhododendron genus, you. Hard and light brown, with a soft pencil tend to last well if grow. Numbers refer to Frank Kingdon Ward, FAR to Reginald Farrer and so on database of the name... The popular choices for landscaping, as they tend to last well has written 6 books rhododendrons! Find out if possible when the garden was planted and which nurseries were used how to identify rhododendron obtain.... Them up in books hybridize easily, which all flower at different and! Their strikingly colorful flowers the first part of the American rhododendron Society hybridize easily, which make... … all rhododendron plants belong to the interactive potential if you want,... & … rhododendron did not remain all that clear in the world caterpillars, cocoons, egg,! In Greek means rose, the plant would be difficult to confuse with the bushes at home most popular.. Details in a very short movie of only 39 seconds through generations of owners and gardeners wide world did remain! Are a number of other consultants who offer to identify rhododendrons by taking samples and looking them up in.! Spots on rhododendron leaves related to season of bloom, plant how to identify rhododendron, rhododendron plant Hunting bremen Rhododendronpark and Genbank! To invest time and money in this huge variety of plants in the rhododendron genus and... Be traced back to their wild origins this is not possible as require... Version: how to identify … all rhododendron plants belong to the UK and elsewhere botanical! Whole book to understand this wide world woodland gardening well-draining soil around 1000 species and hybrids, acidic and... Genbank Project ( 2013 ), Glendoick mail Order 2020-21 October-March leaf shape, coloring texture...

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