Discussion in 'Pacific Northwest Native Plants' started by Landscape Alaska, Nov 15, 2020. Link, Russell. Accept But there over 900 species of rhododendron and countless more thousands of hybrids that are not native to this area. Rhododendron-Phytophthora Blight and Dieback. across (5 cm). Extremely floriferous and slightly fragrant, this best seller Azalea features a handsome foliage of elliptic, flat, olive green leaves that turns deep bronze in fall. It is a very large genus with about 1200 described species. Free-flowering and extremely cold-hardy, Rhododendron 'Dora Amateis' is a remarkable small evergreen shrub. They contrast beautifully with the handsome foliage of small leaves which emerge with bronze tones, mature to dark green before changing back to rich bronze during the winter months. Hairy Manzanita, Arctostaphylos columbiana, Western Maidenhair Fern, Adiantum aleuticum. Most are found in China, Japan and neighboring countries; tropical species are found from Southeast Asia to New Guinea and Northern Australia. Ideal for small gardens, Rhododendron 'Mary Fleming' is an incredibly pretty evergreen shrub. In my coastal Pacific Northwest climate, rhododendrons are a sure winner for nearly every circumstance. height, bloom time, and color may differ in various climates. The other 2 species will be discussed in the section on deciduous shrubs. Attractive landscape plants in cool and moist climates, many varieties have been struggling in the U.S. Pacific Northwest region as a result of sea coast winds and other tough conditions. In late spring to early summer, the air around the flowers is delightfully scented, making this Azalea a valuable addition near a patio and around the home. The blossoms contrast beautifully with the evergreen foliage of elliptic, medium green leaves. In the Landscape: Rhododendrons have long been a favorite of landscapers in the Pacific Northwest. The climate of the U.S. Pacific Northwest region, especially between the Cascade Mountain range and the Pacific Ocean, is very accommodating to the growth of many types of rhododendron … & A. Since the frost damage is generally caused when the early morning sun strikes the plants' frozen tissues, you should site your Azalea or Rhododendron where both leaves and flowers are protected from the early morning sun, and where they will adapt slowly to the increasing temperatures of the day. Check these Great Plant Combination To create additional collections, you must be a paid member of our site. Photos from the top: Arneson Gem, Cannon’s Double, Tiddlywinks (Kalmia), Sanguinaria Canadensis-multiplex, R. occidentale, various hostas, and Himalayan Maidenhair (fern) Exceptionally cold hardy and almost impossibly beautiful, Rhododendron 'Ramapo' is a very compact evergreen shrub that is highly rated for cold climates. Plants of the Pacific Northwest Coast: Washington, Oregon, British Columbia and Alaska. The genus Rhododendron contains about 1000 species distributed from the Arctic to the temperate areas of North America and the temperate and tropics of East Asia. It can enter through wounds. Azaleas and Rhododendrons may be harmed in winter by frozen grounds and drying winds or bright sun which will cause severe foliage dessication. We carry special selections from the Smith Mossman collection. Attractive landscape plants in cool and moist climates, many varieties have been struggling in the U.S. Pacific Northwest region as a result of sea coast winds and other tough conditions. with Rhododendrons - Azaleas, Want Garden Inspiration? The flowering shrub grows along the coast of California, Oregon, Washington, and into British Columbia. Raised and introduced by Gable, 'Rosebud' is extremely cold hardy and regarded as the best pink rose-form full double Azalea. In late spring to early summer, the air around the flowers can be delightfully scented with a sweet and spicy clove scent reminiscent of cottage pinks and carnations. Opening from deep crimson buds in mid to late spring, each funnel-shaped, bright orange flower, up to 3 in. It commonly grows along roadsides in the rainshadow of the Olympic Mountains. Ideas with Azaleas - Rhododendrons, Want Garden Inspiration? In mid to late spring, it bears abundant rounded clusters of 10 to 15, trumpet-shaped, vibrant reddish-purple flowers. Messages: 3 Likes Received: 1 Location: This will help in preventing bark-split (when the sap running in the stem is frozen and burst the bark). From Homepage May 3, 2002. Equally attractive, the deciduous foliage of oblong to oblanceolate, mid green leaves warms up to eye-catching shades of brilliant orange, yellow and red in fall. In the Pacific Northwest the rhododendron is ubiquitous in both public and private gardens. Rhododendron-Ramorum Leaf Blight and Shoot Dieback. Gray) A. Choose a site with dappled shade in sheltered conditions. The dappled shade beneath mature trees is an ideal spot for planting rhododendrons. Even winter brings its charm, when the well-balanced branching structure of this Azalea is fully revealed. The following is a list of Azaleas and Rhododendrons recognized as proven performers in the Pacific Northwest region. Remember that the ability to grow Azaleas and Rhododendrons successfully depends also on the site selection and soil preparation. Often mistaken for one another, mountain laurel and rhododendron are flowering, evergreen shrubs that share more similarities than differences. Phenology: Bloom Period:  April-May. Grows in a compact, dense multi-stemmed and mounding shrub. Slightly fragrant, they blanket this midseason Knaphill hybrid in an exceptional floral display and contrast nicely with the handsome foliage of narrow green leaves which do not develop any appreciable fall color. Prized for its sweet fragrance and bold splashes of color in spring, Rhododendron luteum, commonly known as Pontic Azalea, is a striking, bushy, medium-sized deciduous Azalea. Create spectacular spring borders like this one. Three species of rhododendrons are native to the Pacific Northwest. Indeed, because the winter weather west of the Cascade Mountains is relatively mild, the blooming season is often quite long at the Rhododendron Species Botanical Garden, where flowers of a few species often begin to appear in early January. Shade-loving Hostas are natural companion plants to Rhododendrons and Azaleas. Relationships: The rhododendron genus includes plants commonly known as azaleas. This medium-sized, evergreen shrub bears rounded trusses counting up to 8 open funnel-shaped flowers, 2 in. Note this is the default cart. Both white and pink forms are commercially available . Their soil should be acidic, organic, moist, fertile and well-drained. University of Washington Press, 1999. wide (7 cm), is elegantly frilled and flushed red orange with a gold tinge. RHODODENDRONS IN THE PACIFIC NORTHWEST BY HERBERT IHRIG Ghairman, Rhododendron Committee Arboretum Foundation Seattle, Washington THE greatest area in America for growing rhododendrons is the Pacific Northwest. Most Rhododendrons will tolerate a more open site if sheltered from cold, dry winds. Create a membership account to save your garden designs and to view them on any device. The foliage of elliptic, light green leaves provides excellent fall color and is mildew resistant. Shade-loving plants, Ferns are wonderful companion plants to Rhododendrons and Azaleas. Favored by gardeners in the Northwest, Rhododendron 'Hino Crimson' is a compact, spreading evergreen Azalea of great beauty. Setting the garden ablaze, multiple award-winning Rhododendron 'Gibraltar' is a medium-sized deciduous azalea which produces incredibly eye-catching ball-shaped trusses of 10 to 12 flowers. Opening from delicate pale pink flower buds in late spring to early summer, 'White Lights' bears abundant dome-shaped trusses of 5 luminous, trumpet-shaped, shell-pink flowers, with faint golden markings and gradually fading to white over time. The Rhododendron Species Foundation in Federal Way, Washington, which is dedicated to the conservation, public display, and distribution of Rhododendron species has about 600 species in their display gardens along with many of the over 28,000 cultivated varieties. To use the website as intended please  Many Azaleas and Rhododendrons are fully cold hardy, however a few of them have frost-resistant flowers. Equally attractive, the foliage of obovate, pale green leaves, flushed with pinkish bronze, is borne in handsome whorls at the branch ends. 'Hino Crimson' is a Kurume hybrid Azalea that is so compact that it works perfectly well in small gardens or rock gardens where it adds an impressive color display. If you provide us with your name, email address and the payment of a modest $25 annual membership fee, you will become a full member, enabling you to design and save up to 25 of your garden design ideas. Pacific Rhododendron (Rhododendron macrophyllum), Pacific northwest native shrub. Valued for its luminous flowers and showy fall color, multiple award-winning Rhododendron 'Homebush' is a small deciduous shrub which produces dense, perfectly round trusses of 14 to 16 rose-pink flowers with long stamens elegantly protruding from the corolla. Home Forums > Pacific Northwest of North America > Pacific Northwest Native Plants > Rhododendron camschaticum. Azaleas and Rhododendrons, with their magnificent flowers, are one of the best-loved sights of spring. Pink in bud, each flower opens white flushed pink with deeper stripes, and fade to very pale pink, almost white over time. Six species have been reported in Washington. Since the 1990's, growers in the Pacific Northwest region of North America speculated that a new strain of powdery mildew, infecting evergreen rhododendron, was introduced to the region. Avoid deep shade beneath other trees. Azaleas and Rhododendrons are members of the genus Rhododendron, one of the largest genera in the plant world which includes over 900 species and over 20,000 named hybrids of Rhododendrons and Azaleas. With some of the prettiest flowers, Rhododendron 'Ken Janeck' is a broadleaf evergreen rhododendron which, in mid spring, displays abundant clusters of about 13 to 17 soft pink trumpet-shaped flowers. wide (4 cm), are borne at the tips of the upright branches for a graceful floral display. The western azalea (Rhododendron occidentale) is one of only two species of rhododendron native to the West Coast of North America. Exceptionally pretty and cold hardy, Rhododendron 'White Lights' is a charming deciduous Azalea that belongs to the Northern Lights Hybrid Series developed by the University of Minnesota Landscape Arboretum. Blooming in late spring, the attractive semi-double, trumpet-shaped flowers, 1.5 in. Flowering is so massive that it covers this midseason Gable hybrid in an exceptional floral display that can last up to 6 weeks, and hides branches and leaves. Distribution of Pacific Rhododendron from USDA Plants Database. Well, true, there are a few rhododendrons native to the Pacific Northwest. Use by wildlife: This shrub provides all year cover for wildlife but has very little food value. Grown just for you. The following is a list of Azaleas and Rhododendrons recognized as proven performers in the Pacific Northwest region. Create appealing and long-lasting planting combinations and introduce companion plants with early or late blooming periods, showy fall color, persistent showy berries or providing attractive textural contrast with your Azaleas and Rhododendrons. The dark green leaves are long, narrow, slightly recurved with a thick coating beneath. Wounding and dipping in an IBA hormone aids rooting of cuttings. Becoming a contributing member of Gardenia is easy and can be done in just a few minutes. Sun and heat tolerant, this compact evergreen rhododendron is also extremely cold hardy and a very reliable performer. Azalea are related to rhododendrons. This is found in thickets around moist areas, seepages and creek sides in the mountains and foothills along the Pacific coast of southwest Oregon to southern California. All are fascinating. Easy to grow, 'Ramapo' is also heat tolerant and can be grown in full sun, but will remain more compact than if grown in shade. An extremely hardy selection which is also extraordinary mildew resistant. In May, when our northwest native Rhododendron macrophyllum is in bloom, I love driving through Whidbey Island or around the Kitsap and Olympic Peninsulas, spotting the vast amount of this native species in full regalia. Using Pacific rhododendron plants as part of natural landscaping provides eye-popping blooms combined with ease of care. WTU Herbarium Image Collection, Plants of Washington, Burke Museum, E-Flora BC, Electronic Atlas of the Flora of British Columbia, USDA Forest Service-Fire Effects Information System, Native American Ethnobotany, University of Michigan, Dearborn. Growth:  It reaches to about 24 feet (8m); taller in the shade than in the sun. Only plants will be removed from the collection. Since the blooms open in batches over long periods, that may extend up to 2 months, 'Christmas Cheer' truly is an outstanding early flowering Rhododendron. Cause Phyllosticta spp., a fungus found on wild as well as cultivated rhododendron. Some are fragrant and others feature a wonderful foliage adding glorious fall color to the landscape. wide (5 cm). Deer and Mountain Beavers are among the few that browse on Pacific Rhododendron. Regarded as the largest flowered, scented, white azalea species, Rhododendron occidentale, commonly known as Western Azalea, is a plant of great beauty and captivating fragrance that appeals to virtually everyone who comes upon it. This Rhododendron hybrid is drought tolerant and will need some shade in mild winter areas. Its large floral trusses produce a magnificent display with their 7 to 17, funnel-shaped, bright golden-yellow flowers, up to 2 in. As the leaves emerge in mid to late spring, abundant clusters of 3 to 6 slightly scented, saucer-shaped pink flowers appear at the branch tips, adding elegance and beauty to this early midseason Azalea. has been written based on numerous outside resources. Blooming in mid spring, the blossoms of this early midseason rhododendron cover this dwarf rhododendron in a brilliant color display. Since most Azaleas and Rhododendrons provide colorful interest in spring, choosing bulbs or perennials with fall and winter interest would enable you to enjoy appealing and long-lasting planting combinations. Producing a blaze of color from early spring through the summer, and even into the fall, Azaleas and Rhododendrons are popular ornamental shrubs for gardens of all sizes. The flowering is so intense that the blooms of this midseason Azalea almost entirely cover the shrub. Each richly colored bloom of this midseason rhododendron opens up from deep rose-pink buds to pale pink blossoms and gradually fades to white, the upper lobe being slightly spotted green. it was the inspiration for the Pacific Horticulture logo, which was designed in the 1970s by artist Wynn Hayakawa, daughter of the late Margedant Hayakawa, a founding board member and former president of Pacific Horticultural Foundation. Each flower has 5 lobes with wavy edges. Ideas with Rhododendrons - Azaleas, Extend the Blooming Season of your Azaleas and Rhododendrons, Choosing Perfect Azaleas and Rhododendrons, Beautiful Azaleas and Rhododendrons for the Midwest, Beautiful Azaleas and Rhododendrons for the Mid-Atlantic Region, A Spectacular Spring Border Idea with Brilliant Tulips and Cotinus, A Four-Season Border with Evergreen Conifers and Japanese Maples, A Super Climbing Duo with Crimson Roses and Purple Clematis, A Late Season Border Idea with Asters and Grasses, A Glowing Fall Border with Asters, Dogwood and Grasses, A Treasured Winter Border Idea with Hellebores, Sedge and Dogwood, Azaleas - Rhododendrons, Rhododendrons - Azaleas, Beautiful Azaleas and Rhododendrons for the Pacific Northwest Region. Highly popular in North America and exceptionally cold hardy, Rhododendron 'PJM Elite' is a vigorous and showy evergreen shrub. Seed capsules ripen August to September. To be selected for such an award, a plant must have excellent foliage and flowers, have an attractive plant habit, be pest and disease resistant and be cold hardy for the region. While a single Japanese maple can provide a striking focal... With its rich purple blooms, Clematis Etoile Violette' is a... An excellent border idea for the sunny landscape. Pacific Rhododendron is also useful for erosion control on steep watersheds. The pink, sometimes white, bell-shaped flowers are borne in showy clusters called trusses. Wild Pacific Rhododendron, also called coast rhododendron, is a beautiful native shrub of the Pacific Northwest that starts to bloom in late April and early May on low elevations to late May and late June on higher elevations in the mountains. T/F: Rhododendrons are native to the Pacific Northwest. Native Plants of the Pacific Northwest. North Albany resident Jim Hoffman quit his job as a store manager at Oregon State University this week to work … In the Pacific Northwest, an emphasis on native vegetation in landscaping also has he… The leaves are 3–9 inches long and 1–3 inches wide. Blooming in early to mid spring, it displays an abundance of ball-shaped trusses each counting up to 6 brilliant scarlet red flowers with dark crimson throats. Their flowers range from the tiny and delicate blossoms of floriferous dwarf shrubs to the huge clusters or 'trusses' of tall growing hybrids and species. Difficult to grow outside the Pacific Northwest and California, Rhododendron occidentale is a choice native plant for our region. A very reliable performer, this showy Rhododendron is tough and can withstand temperatures as low as -25ºF (-32ºC). Relatively few are native to Europe and North America. Gardening with Native Plants of the Pacific Northwest; an Illustrated Guide. Rhododendron macrophyllum (meaning rose tree with large leaves), more commonly known as the Pacific rhododendron or the coast rhododendron, is native to the Pacific Northwest.They grow west of the Cascade Mountains between British Columbia and Northern California. Gray (roe-doe-DEN-dron ahk-sih-den-TAY-lee) Names: Occidentale means western; so Rhododendron occidentale, literally means, “western rose-tree.” It is sometimes called Pacific Azalea or California Azalea. The Pacific Northwest naturally has soil with low pH because of copious rain, but much of the area has heavy clay soil, so mixing compost to the bed before planting is advised. Blooming in early to mid spring, this Rhododendron hybrid bears an abundance of trumpet-shaped pure white flowers, slightly speckled pink and green within, and emitting a spicy perfume. Clark's Native Trees & Shrubs ... Rhododendron Macrophyllum (Pacific Rhododendron) This is a beautiful evergreen shrub that grows 7-30 feet tall. 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Orange with a mulch of oak leaves or pine needles and their foliage with material... And round, the blossoms of this midseason Azalea almost entirely cover the shrub in a,! Shade-Loving Hostas are natural companion plants to Rhododendrons and Azaleas ( Pacific Rhododendron is one the! Pruning encourage compact growth and bloom [ 33,35 ] well-branched shrub to large, tree-like.... Vigorous and showy evergreen shrub that is highly rated for cold climates, flowers!