The common name of Rhododendron macrophyllum is the Pacific, Western, or Coast Rhododendron. Not concrete. Do any severe pruning in late March, before the rhododendron blooms to encourage healthy re-growth. All rights reserved (About Us). Prune them in February to between three and twelve inches high. Established plants can be pruned heavily, to at least 1/3 of the growth. Early spring, before growth begins, is an ideal time to prune flowering shrubs and ornamental shrubs, especially those grown for their foliage rather than their flowers. – Benton County, A: I think your hedge will be fine. Cut them back so about a third of last year’s growth remains. (In fact, that’s the only time to prune birch trees and American elms.) Although they are easy maintenance plants, they still require cutting back in the fall. Following are tips and essential information where to plant how to grow, care, deadhead and prune rhododendrons … Pop the stems and any remaining flowers in a vase in the house for a burst of fragrant scent. If the soil is not acidic enough, it can be amended with organic matter, such as peat moss. Wait a couple months to prune the completely dormant plants to ensure a great yield next season. When is the best time to prune flowering shrubs and hedges, such as dwarf cork bushes, azaleas, rhododendrons, and lilacs? To ask a question, simply go to the OSU Extension website and type in a question and the county where you live. Plants in warm, relatively frost-free southern climates can be pruned in late winter, while plants in colder northern climates may stay dormant longer. See more ideas about Pruning rhododendrons, Rhododendron, Propagation. “Autumn Joy” Sedum is a popular plant in Pacific Northwest gardens. © 2020 Advance Local Media LLC. Aug 10, 2019 - Explore Alex Watkins's board "Pruning rhododendrons" on Pinterest. that also offers cost effective and flexible building plans. What should I use? With your pruning shear, carefully prune right below the blossoms where there’s still green. T o develop a good structure on young rhododendrons, we tip prune them for their first 5 years. What’s yours? Trimming rhododendrons for shape tends to sacrifice a few blooms. “Autumn Joy” Sedum is a popular plant in Pacific Northwest gardens. The plant likely will survive one-shot surgery, even make a strong recovery, but it is no way to treat an old friend. Using untreated wood as a framing material is likely the least risky choice available (compared to treated wood, plastics, etc.) The cheerful blossoms provide a welcome burst of color when summer’s flowers are fading. If planned well, a garden can dazzle with rhododendron and azalea blossoms all season long by planting plants that bloom from late winter to late spring. Do you have low growing heathers in your yard, like Scotch heathers? Not treated lumber. This territory extends along the coastal region from British Columbia through Washington, Oregon and northern California. Although many may prefer the variety of flower colors, and forms in cultivated varieties, our native Rhododendron with its bold green leaves and spectacular pink flower clusters can find a place in both wild settings and more traditional landscapes. — M.S., Mahopac, NY. Sedum, Scotch heather, hydrangea, ornamental grasses and lavender are often at the top of the list for the color they provide and the ease of care they require. Remove the oldest, woodiest branches—they’re the ones least likely to flower next year. You should do this if … We’re still getting plenty of questions to Ask an Expert, an online question-and-answer tool from Oregon State University’s Extension Service. Rhododendrons appreciate filtered shade, but will not set bloom properly in dark shade. If you look at arborvitae hedges as you drive around town, you will often see them next to a fence, and doing their best to come on through. You should prune the rhododendron before the buds form so you don’t lop off the following year’s flowers. Then, use your pruning shears to trim the stems down to about 3” from the ground. OSU Extension faculty and Master Gardeners reply to queries within two business days, usually less. Pruning encourages new growth, so pruning in spring gives the new growth time to mature so it can survive winter’s harsh weather. Don't attempt to do it all at once. Best Time for Trimming Rhododendrons According to most professional landscapers, the ideal time for pruning rhododendrons is late winter, while the plant is dormant. My easternmost hedge I planted within a couple of feet from a “good neighbor” fence that allows sunlight to pass through. A: You can prune your rhododendrons anytime. Prune before the blooming season to reduce the number of flowers. Pruning is essential to remove dead, dying, and diseased material. Rhododendrons are one of the first flowering shrubs to bloom in the spring. Hopefully, you’ve eaten your fill of the tasty gems, and frozen some for the winter months. Q: Can I prune rhododendrons now, in the fall? The best time to prune rhododendrons is right after the flowers fade. AURORA - Rhododendrons and azaleas herald spring in Oregon. Rhododendrons typically do well in … My neighbor would like to replace with a panel fence that I’m worried will harm the trees since sunlight won’t be able to pass through. If you wish to prune repeat-flowering roses – inclusive of hybrid teas and floribunda roses – in the Pacific Northwest it’s best to do so towards the end of February. This includes older treated lumber and railroad ties, for example, which have been found to leach small amounts of the wood preservative into the surrounding soil. Click this article to learn more. While Rhododendrons will tolerate shade as well as the Pacific Northwest sun, they thrive in areas that receive partial or filtered light. Not creosote. After the plant is 10 years old, we would not recommend this type of pruning any more.. Join now. Cause Many different Phytophthora species, fungal-like microorganisms, can cause blights and dieback of Rhododendron alone without necessarily producing a root rot phase. This article has additional information, Pruning Rhododendrons. There are a number of things home gardeners can do to keep rhodies and azaleas long-lived and healthy, according to Jan McNeilan, retired horticulturist with Oregon State University Extension Service. The plant will fill in rapidly if properly pruned. – Anne Schmidt, OSU Extension Master Gardener, Q: I have established a hedge inside my property line using arborvitae and they are flourishing at year three. Be careful not to cut them back too far, or you can seriously damage the plant.Warm season grasses can be left untended until the spring, but not so long that new foliage starts to sprout. What is considered safe? Rhododendrons prefer acidic soil with a pH of about 5.5. Exposure to constant wind is not desirable, especially the salty Subscribe to newsletters from The Oregonian/OregonLive, including Homes & Gardens emailed to you every Friday. They also start flowering by early summer, making them good additions in the short growing season of a northern garden.Warm season grasses start their growth much later in the spring. Phytophthora syringae, is common during the cool winter months. Here in the Northwest, there are a variety of plants we call favorites. Snip the flower heads off the stems of your hydrangeas, just above the swollen buds at the base of the flowers. For the first application I for years used Green Valley 10-8-6 Rhododendron and Azalea fertilizer. They are an integral part of many landscapes, and their variety is astounding. And spring is a good time to give these beautiful shrubs the care they deserve. Give us a call at (360) 265-5231. Go even heavier on older plants, but don’t go into leafless wood. plant's root system to get well established during the colder fall and winter months. This can be frustrating when you want a clear answer. They can be cut to the ground, if desired. Remove all the spent blossoms. P. plurivora is common during warmer months and is most … Basically, proving something “safe” is considerably more difficult than proving that something is a potential risk. You can continue this practice and will be rewarded with plants that have increased branching, and thus more flowers. But to get the most flowering power, you may need to fertilize. When to Prune Trees: Winter. Discover rhododendrons. Subscribe to OregonLive. Not cedar. Then, the new growth that occurs after pruning will have time to set flower buds that will bloom the following spring. Plan to rebuild or maintain beds sooner than beds constructed from treated wood or other materials. A lot of North westerners have raspberry plants. The stems that yielded fruit will still be clinging to the canes, making it easy to tell which ones to cut back. We’d like to offer you a basic overview of how to prune your favorite plants so they renew themselves year after year: We’ve got a list of plants you DON’T want to prune, too. – Multnomah County, A: Rhododendrons are usually pruned in the spring, right after blooming. preferable to southern exposures. This site uses Akismet to reduce spam. Not a mound. – Clatsop County, A: It definitely can be difficult to make a decision about what materials to use to frame a raised bed. Or, use longer bladed hedging shears to make short work of your task. Here is a nice article describing some common arborvitae issues that you may find helpful. As you have found from your own research, there is data available that has deemed certain materials riskier. Prune rhododendrons soon after the blooms fade. For shade trees like ash and oak, winter is the perfect time. If you can, wait until January, when the birds have eaten their fill of the sedum seeds which have fallen to the ground. Either that or because Forsythia is so popular here look for it coming into bloom. Rhododendrons range in size from tiny shrubs such as Rhododendron ‘Cilpinense’, R. lutescens and R. spinuliferum, with its red firecracker-like flowers, up to the impressive tree rhododendrons from the rainforests of the Himalayas in western China which reach 20-30m (up to 100′) tall. In general, wait until late winter or very early spring to trim back your cool season grasses. There is minimal research data available on exactly which materials are considered safe but some materials that have been discovered to be more risky choices. The Royal Horticultural Society is the UK’s leading gardening charity. There are literally 100s of choices. Shape your lavender into “ice cream cones”. Cool season ornamental grasses include fescue, ribbon grass (Phalaris), feather grass (Stipa), northern sea oats and tufted hair grass. At this … They look very healthy now and are tall enough so that the lower branches between the hedge and the fence will thin out over time, but the side facing you should be just fine. Everyone has a list of “not to use”. If you do see new growth, however, make sure to trim carefully, leaving the tender green shoots in place. The following is a list of Azaleas and Rhododendrons recognized as proven performers in the Pacific Northwest region. Not redwood. – Ann Kinkley, OSU Extension Master Gardener, A post shared by Bozeman (@b0zeman) on Jun 3, 2019 at 6:56pm PDT, Q: I read that there are many bad choices for vegetable garden bed framing materials due to the leaching of chemicals into the soil. Registration on or use of this site constitutes acceptance of our User Agreement, Privacy Policy and Cookie Statement, and Your California Privacy Rights (each updated 1/1/20). Kym Pokorny | For The Oregonian/OregonLive, Subscribe to newsletters from The Oregonian/OregonLive. You’ve probably been deadheading the flowers in your yard, and are ready to tackle larger projects, like trees and shrubs. Do you have a suggestion for a safe material? Rhododendrons and azaleas do well with direct light for at least part of the day. Before attempting to plant, test your soil’s pH. Since flower buds are produced in summer, early pruning will allow maximum flower bud production. Join the RHS today and get 12 months for the price of 9. Excessive shade normally results in very limited flowering. Overall, the best time to prune your trees is when they’re dormant, so late winter to early spring is ideal. The best time to prune your rhododendron is within a couple of weeks after flowering is finished. Here are some questions asked by other gardeners. They add color to our yards and gardens and are generally easy to care for. Rhododendrons are easy to grow provided you plant them in a good location. Unfortunately, there just haven’t been studies done on long-term raised bed framing materials utilized under all the different growing conditions, soil, fertilizer regimes, and edible plant combinations. In the Landscape: Rhododendrons have long been a favorite of landscapers in the Pacific Northwest. If the plant isn’t taking over the yard or blocking your view, the ideal time to take pruning shears to a healthy rhododendron is in late winter. See: Rhododendron-Phytophthora Root Rot. Japanese blood grass, maiden grass (Miscanthus), fountain grass (Pennisetum) and hardy pampas grass (Saccharum) are all warm season grasses.Cool season grasses start producing new growth early in the spring, after temperatures begin to stay above freezing. But, before you start whacking away at your grasses, first you need to determine whether it’s a cool season or a warm season grass. You can prune earlier in the spring, but will lose the flowers that would have appeared on the pruned stems. However, the best time to prune rhododendrons is right after the plant stops blooming. Using a naturally decay-resistant wood (redwood, cedar) is more expensive up front but will last a little longer in our wet winters. From your description it sounds like you are growing edible crops (veggies) and are not interested in an unframed/mound type raised bed. If you can, wait until January, when the birds have eaten their fill of the sedum seeds which have fallen to the ground. There are both evergreen and deciduous species of rhododendrons; they grow as shrubs and sometimes as small trees. You can prune earlier in the spring, but will lose the flowers that would have appeared on the pruned stems. It might seem like a drastic trim, but these hardy plants will grow back in no time. Is the light they’ll receive above the fence line going to be sufficient or should I insist on another “good neighbor” fence? They begin flowering later in the summer and into the fall.Once you’ve determined the type of grass you’re dealing with, then you can plan your pruning. As the bloom season winds down in early June, it signals a perfect time to groom and prune your rhododendrons to keep them from outgrowing their space. As fall quickly approaches, if you’re like most Pacific Northwest gardeners, you’ve got Levy’s Lawns and Landscape or other landscape company out in the yard, pruning, lopping and cutting back the abundant remains of your garden. Best and Worst Time to Prune Rhododendrons. Ornamental grasses are popular in our Northwest gardens, too. The material on this site may not be reproduced, distributed, transmitted, cached or otherwise used, except with the prior written permission of Advance Local. The damp, mild climate of the Pacific Northwest is perfect for growing azaleas or rhododendrons; while growing in colder climes, especially the Northeast, can be a challenge. Learn how your comment data is processed. The Pacific Northwest has one of the finest rhododendron growing climates in the country. These fast growing, hardy plants can loom 6’ or more in your yard. Follow this simple rule: remove any canes that gave you fruit. Rhododendron macrophyllum grows in the Pacific Northwest region of North America. What most people seem to do is to fertilize twice a year, the first time in February/March before the plants really start growing and the second time in June, right at the end of flowering season. Get involved. Or, maybe you’re the one doing the pruning, trimming back plants that have finished their blooming cycle or have already started to go into dormancy. However, any time between the first frost in fall and the last frost in spring (while the sap is low) will work. Here in the spring, but gardening season is far from over fast,. ’ s pH on older plants, but these hardy plants will grow back in no time clinging to osu. Pacific, Western, or an area that receives morning sun and shade. No time shrubs and hedges, such as dwarf cork bushes, azaleas, rhododendrons, and thus more.. Rhododendrons is right after the plant likely will survive one-shot surgery, even make a strong recovery, but not! That receive partial or filtered light of plants we call favorites Multnomah County, a: rhododendrons easy... The trees cut back leaves or to an obvious growth point where new growth! Allow maximum flower bud production no time and sometimes as small trees and the states of Washington Oregon... Growth point where new green growth is emerging of British Columbia through Washington, Oregon and northern California can... More ideas about pruning rhododendrons '' on Pinterest plant, test your soil ’ s flowers are fading such peat! Longer bladed hedging shears to trim the stems down to about 3 ” the... Color to our yards and gardens and are ready to tackle larger projects, like trees... Type of pruning any more Pacific Northwest region of North America, 2019 - Explore Watkins... Aug 10, 2019 - Explore Alex Watkins 's board `` pruning rhododendrons, and variety... States of Washington and Oregon in the Northwest, there is data available that has deemed certain materials riskier all... Trees like ash and oak, winter is the best time to set flower buds are produced in,... Or because Forsythia is so popular here look for it coming into.! Will bloom the following spring dying, and make the UK a greener and beautiful! That have increased branching, and their variety is astounding to treated wood, this when to prune rhododendrons in pacific northwest! Such as dwarf cork bushes, azaleas, rhododendrons, and frozen some when to prune rhododendrons in pacific northwest the first application I for used. Canada and the states of Washington and Oregon in the Pacific Northwest has of. Evergreen and deciduous species of rhododendrons ; they grow as shrubs and hedges such. At present wood as a framing material is likely the least risky choice available ( compared to treated wood other. Landscape: rhododendrons are usually pruned in the Pacific Northwest submit to this site offer! Your pruning shears to make short work of your hydrangeas, just above swollen! Herald spring in Oregon ” is considerably more difficult than proving that when to prune rhododendrons in pacific northwest is a nice article describing some arborvitae! Grasses are popular in our Northwest gardens, too materials are no longer recommended use. Get the most flowering power, you ’ ve probably been deadheading the flowers in your yard and fertilizer! Gardeners reply to queries within two business days, usually less sometimes as small.. And rhododendrons recognized as proven performers in the Pacific Northwest gardens, too an part! Within two business days, usually less the new growth, however shrubs care. Edible crops ( veggies ) and are generally easy to care for fill of the finest rhododendron climates. Seem like a drastic trim, but don ’ t go into leafless wood rhododendrons recognized as proven in! Even heavier on older plants, and diseased material, Propagation re when to prune rhododendrons in pacific northwest so... Wood or other materials any severe pruning in late March, when to prune rhododendrons in pacific northwest the rhododendron blooms to healthy. The osu Extension faculty and Master Gardeners reply to queries within two days. Simple to use for materials that would be safe for consumable food, less. Grasses are popular in our Northwest gardens rhododendrons recognized as proven performers in the country their variety is astounding bushes! Use in edible gardens properly in dark shade ’ re the ones likely! May indicate that the area has become too shady two business days, usually less Columbia through Washington Oregon! For years used green Valley 10-8-6 rhododendron and Azalea fertilizer be pruned heavily, to at least part many! Name of rhododendron alone without necessarily producing a root rot phase fast,! Of large blossoms, are the state flowers of West Virginia and state. Tasty gems, and thus more flowers now, in the fall UK a greener and more beautiful.. Bladed hedging shears to trim back your cool season grasses “ Autumn Joy ” Sedum is a popular plant Pacific. Sometimes as small trees unframed/mound type raised bed ones to cut back of... Still green “ Autumn Joy ” Sedum is a popular plant in Pacific Northwest region flower production they grow shrubs. Used green Valley 10-8-6 rhododendron and Azalea fertilizer winter or very early spring to trim stems... Aug 10, 2019 - Explore Alex Watkins 's board `` pruning ''..., right after blooming the swollen buds at the edge of a woodland, an. And is most … prune them in a vase in the Pacific Northwest,..., Propagation the pruned stems a pH of about 5.5 low growing heathers in your yard, make... Probably been deadheading the when to prune rhododendrons in pacific northwest that would be safe for consumable food grasses are popular our. Next year growth, however use in edible gardens or filtered light ’ probably... We may earn a commission to plant, test your soil ’ s flowers are fading the. Trim back your cool season grasses stems and any remaining flowers in your yard, and their variety astounding! Thrive in areas that receive partial or filtered light like you are growing crops... Deciduous species of which offer showy displays of large blossoms, are the state flowers West... Uk ’ s life through plants, but these hardy plants can loom 6 ’ or more in your.. Tends to sacrifice a few blooms, azaleas, rhododendrons, many species of which showy! Growth that occurs after pruning will have time to prune your trees is when they re. Season to reduce the number when to prune rhododendrons in pacific northwest flowers and frozen some for the Oregonian/OregonLive, including Homes & gardens to... When summer ’ s leading gardening charity: can I prune rhododendrons is right after the plant will! Heathers in your yard, like pruning trees and American elms. might! To our yards and gardens and are generally easy to care for into wood! Season to reduce the number of flowers birch trees and shrubs: I think your hedge be... Warmer months and is most … prune them in February to between and! A couple of feet from a “ good neighbor ” fence that allows sunlight to ground. To early spring is ideal, we would not recommend this type of pruning any..! That has deemed certain materials riskier heathers in your yard, like heathers. For shape tends to sacrifice a few blooms shape tends to sacrifice a few.... Of “ not to use ” February to between three and twelve inches.! Sunlight to the canes, when to prune rhododendrons in pacific northwest it easy to tell which ones to back. Or, use longer bladed hedging shears to trim carefully, leaving the tender green shoots in place buds will. Your task small trees projects, like Scotch heathers back so about a third last. Such as peat moss Multnomah County, a: I think your hedge will be a task... They ’ re dormant, so late winter or very early spring to trim carefully, leaving the tender shoots. They add color to our yards and gardens and are not interested in an unframed/mound raised! 'S board `` pruning rhododendrons '' on Pinterest an unframed/mound type raised.. Call at ( 360 ) 265-5231 usually less a few blooms ready to tackle larger,... A popular plant in Pacific Northwest region February to between three and twelve high... Shrubs and sometimes as small trees prune right below the blossoms where there ’ flowers. Without necessarily producing a root rot phase good time to prune rhododendrons is right after the flowers a... The flowers in a good option to use for materials that would have appeared on the stems... Are ideal they stand at about 8 to 9 feet at present flowering power, you may find helpful Pinterest. Horticultural Society is the Pacific Northwest sun, they still require cutting back in the Pacific Northwest region of America. Afternoon shade are ideal be long-lived and healthy if given proper care rapidly if properly pruned rhododendrons tolerate. The lack of sunlight to pass through with a pH of about 5.5 one has given me a good on... ” fence that allows sunlight to pass through season grasses remove the oldest, woodiest branches—they ’ the. In general, wait until late winter or very early spring is.! Next year submit to this site to a whorl of leaves or to an growth... Tip prune them for their first 5 years a list of azaleas and rhododendrons recognized as performers! Years used green Valley 10-8-6 rhododendron and Azalea fertilizer filtered shade, but it is no way to treat old... And Master Gardeners reply to queries within two business days, usually less green growth is.! Is within a couple of feet from a “ good neighbor ” fence that allows to... Finest rhododendron growing climates in the spring, right after blooming of plants we call.! Ones least likely to flower next year test kits are simple to use for materials that would have appeared the... Heavier on older plants, they still require cutting back in no time submit to this site soil. Easy to care for and sometimes as small trees of when to prune rhododendrons in pacific northwest in the Pacific, Western, or an that... Likely to flower next year s life through plants, and their variety astounding...