Regions / Eastern Washington, Eastern Oregon, And Idaho
Selecting plants suited to the Eastern Washington, Eastern Oregon, and Idaho climate is a key step to success.
A plant's performance is governed by many climate related factors including the length of the growing season, the amount of rainfall, winter lows, summer highs, wind or humidity. Various initiatives have taken place to determine how well plants would withstand the cold winter temperatures (Plant Hardiness Zones) or when plants would start suffering from the heat (Plant Heat Zones). A more sophisticated approach has been followed by Sunset which defines Climate Zone Maps based not only on hardiness or heat tolerance, but also on precipitations, wind, humidity and various other climate related factors.
Native to Siberia, Achillea sibirica subsp. camschatica 'Love Parade' (Yarrow) is an upright, tufted, perennial with large umbels of soft pink flowers with pale yellow stamens from early summer to early fall. Attractive to butterflies, the charming blossoms rise atop an equally attractive foliage of bright green, almost shiny, leathery, dark green, lance-shaped leaves. Good-looking, compact, bushy and heat loving, this eye-catching beauty enlivens any sunny corner of the garden.
Blooming later than most Aconitum species, award-winning Aconitum carmichaelii 'Arendsii'(Monkshood) is an erect, tuberous perennial with dense spires of rich azure-blue flowers in early to mid fall. Its hooded flowers resemble the hood worn by medieval monks, hence the common names of monkshood. They are borne atop thick, rigid stems clad with a handsome foliage of deeply divided, leathery, dark green leaves.
Ideal for wet areas, Acorus calamus 'Variegatus' (Variegated Sweet Flag) is an attractive herbaceous perennial forming a tuft of gracefully arching, narrow, sword-shaped leaves adorned with creamy-white and green stripes. Often displaying a nice pink tinge in cold weather, the foliage is sweetly fragrant when bruised.
Ideal for wet areas, Acorus gramineus 'Ogon' (Golden Variegated Sweet Flag) is a semi-evergreen herbaceous perennial forming an attractive tuft of gracefully arching, narrow, sword-shaped, golden-yellow leaves adorned with olive green stripes. The foliage is sweetly fragrant when bruised and evergreen in mild winter areas.
Striking all summer long, award-winning Actaea racemosa (Black Cohosh) is a beautiful perennial with deep green, finely divided foliage, enhanced by gracefully arching wands of fragrant white flowers in late summer and fall. The blooms are packed in fluffy spikes, up to 2 ft. long (60 cm), which rise well above the foliage, and mature into attractive seed pods.
Striking all summer long, Actaea simplex 'Pink Spike' (Baneberry) is a beautiful perennial with chocolate-purple, finely divided foliage, enhanced by gracefully arching wands of fragrant pink flowers in late summer and fall. Raspberry-pink in bud, opening to pale pink, the heavily scented flowers are packed in fluffy spikes along black waving stems.
Rich of an exotic perfume of grape and jasmine, Actaea simplex 'Black Negligee' (Baneberry) is a herbaceous perennial prized for its finely-divided, near-black leaves and eye-catching flower spikes. Standing out in late summer to early fall, attractive, dark stemmed fluffy spires, packed with deliciously fragrant creamy-white flowers adorned with a purple tinge, gracefully bob and sway in the breeze.
Striking all summer long, award-winning Actaea simplex 'Brunette' (Baneberry) is a beautiful perennial with purple black, finely divided foliage, enhanced by gracefully arching wands of fragrant white flowers in late summer and fall. Purple-pink in bud, opening to white, the heavily scented flowers are packed in fluffy spikes along black waving stems. 'Brunette' provides interest for months.
Striking all summer long, award-winning Actaea simplex 'Hillside Black Beauty' (Baneberry) is a beautiful perennial with dark reddish-purple, finely divided foliage, enhanced by gracefully arching wands of scented, pale pink flowers in late summer and fall. Their strong fragrance is reminiscent of summer phlox and ripe purple grapes.
Opening from pink buds in late summer to early fall, attractive, purple stemmed fluffy spires, packed with deliciously fragrant white flowers with a pink tinge, gracefully bob and sway in the breeze
Actaea simplex 'Mountain Wave' (Baneberry) is a herbaceous perennial prized for its finely-divided, bronze leaves and eye-catching flower spikes. Standing out in late summer to early fall, attractive, dark stemmed fluffy spires, packed with deliciously fragrant creamy-white flowers adorned with a purple tinge, gracefully bob and sway in the breeze.
Grown for its attractive foliage and edible fruit, Actinidia arguta 'Issai' (Hardy Kiwi Vine) is a compact, deciduous climber that produces grape-sized, smooth-skinned, green fruits in late summer to early fall. While they are smaller than grocery store varieties, they are slightly sweeter and enjoy an excellent flavor.
Actinidia deliciosa (Kiwifruit) is a vigorous, deciduous, woody-stemmed, twining climber with broadly ovate, heart-shaped, lustrous mid-green leaves, 5-8 in. long (12-20 cm). Slightly fragrant clusters of cup-shaped, creamy-white flowers are borne in late spring.
Prized for its flamboyant foliage, Actinidia kolomikta (Variegated Kiwi Vine) is a large vigorous deciduous climber producing a striking foliage mass of heart-shaped leaves, 3-5 in. long (7-12 cm), some in solid green, others white-splashed green and others heavily variegated with pink.
Creating a sparkling effect, Actinidia polygama (Silver Vine) is a vigorous, scrambling/twining, deciduous climber producing a striking foliage mass of heart-shaped, dark green leaves, 3-5 in. long (7-12 cm), adorned with silvery-white tips - as if each leaf has been dipped in paint.
Incredibly attractive, Adiantum aleuticum (Maidenhair Fern) is a deciduous or semi-evergreen, perennial fern with graceful, bright green fronds which open like the fingers of a hand atop upright, shiny, purple-black wiry stems. Each finger is further divided into a series of triangular segments (pinnules).
Incredibly attractive, Adiantum venustum (Himalayan Maidenhair) is a deciduous fern, almost evergreen in mild areas, with broadly triangular fronds composed of many small fan-shaped segments. Emerging in late winter to early spring, the new fronds display a charming salmon flush before maturing to fresh spring green.
Luminous, Agastache rugosa Golden Jubilee' (Korean Mint) is an upright, clump-forming perennial with attractive spikes of fragrant, tubular, lavender-blue flowers from midsummer to early fall. Adding lovely vertical lines to the landscape, they are held over the golden-green foliage of aromatic, lance-shaped leaves.
Agastache rupestris features sweetly fragrant, tubular salmon-orange flowers with purplish calyxes all summer. Eye-popping, it provides an outstanding garden performance and adds color as well as a lovely spiky texture to the garden. Hummingbirds will thank you for it.
Slow growing, Agave colorata (Mescal Ceniza) is an evergreen, perennial succulent forming a rosette of fleshy, nearly spoon-shaped, powdery blue leaves with particularly fascinating crossbanding. Rough textured, the leaves are deeply scalloped and lined with formidable, dark brown teeth along their margins and tipped with a stout terminal spine.
Extremely cold hardy, Agave havardiana (Havard Agave) is an evergreen, perennial succulent forming a tight rosette of fleshy, broad, cupped, silver-gray leaves. Adding an attractive texture and interest year-round, the leaves are heavily lined with dark brown teeth along their margins and tipped with a wickedly sharp black terminal spine.