Category Archives: Native Plants

Western Hemlock

Western hemlock (Tsuga heterophylla)
Tsuga heterophylla

Western hemlock (Tsuga heterophylla) is the state tree of Washington, and the largest species of hemlock, growing up to 200′ tall with a trunk diameter of up to 4′. It makes a beautiful addition to any property where it has room to grow.

Western hemlocks grow into a narrow, upright, somewhat ragged cone as they grow, with very top of the tree typically drooping over just a little bit. The needles are short and flat, averaging less than 1″ long. The small round cones dangle from the branches and have long, thin, flexible scales. The bark is thin, brown, and furrowed in texture.

This tree is an important source of food for many birds and mammals. Yellow-bellied sapsuckers nest in the tree’s cavities, and barred owls prefer dense stands of Western hemlock. Flying squirrels and other small mammals nest in hemlocks, and many animals browse the inner bark and young needles and take shelter in the dense foliage.

Western hemlock is a very shade-tolerant tree, with young plants able to grow under a closed canopy of fast-growing, shade-intolerant conifers such as Douglas-fir. Disturbances like fire or logging open up sunny areas where new generations of Douglas-fir and other sun-loving seedlings can survive, but without that disturbance, hemlocks end up dominating the canopy…and Western hemlocks can live up to 1200 years old! If you are in a forest made up of mostly large hemlocks, you know that forest has been undisturbed for a very long time.

  • Light Requirements: Full Sun, Part Shade, Full Shade
  • Water Requirements: Dry, Moist
  • Ease of Growing: Easy to grow
  • Growth Rate: Fast
  • Spreads: No
  • Wildlife Support: Pest-eating Insects, Birds or Mammals
  • Fire-resistant: No
  • Edible: No
  • Mature Height: 120-200
  • Mature Width:30-40ft

Oregon Oxalis

Oregon oxalis (Oxalis oregana)
Oxalis oregana

Oxalis oregana, also known as Redwood sorrel, is a species of the wood sorrel family, Oxalidaceae, native to moist Douglas-fir and Coast Redwood forests of western North America from southwestern British Columbia, Washington, Oregon, and California. This attractive groundcover can spread vigorously when planted in favorable conditions.

It is a short herbaceous perennial plant with erect flowering stems 5-15 cm tall. The three leaflets are heart-shaped, 1-4.5 cm long on 5-20 cm stalks. The inflorescence is 2.4-4 cm in diameter, white to pink with five petals and sepals. The hairy five-chambered seed capsules are egg-shaped, 7-9 mm long; seeds are almond shaped.

Oregon oxalis photosynthesizes at relatively low levels of ambient light (1/200th of full sunlight). When direct sunlight strikes the leaves they fold downwards; when shade returns, the leaves reopen. This process only takes a few minutes and the movement is observable to the eye.

The tangy leaves of Oregon oxalis were eaten by Native Americans, probably in small quantities, since they contain mildly toxic oxalic acid (hence the genus name).


  • Light Requirements: Part Shade, Full Shade
  • Water Requirements: Moist
  • Ease of Growing: Easy to grow
  • Growth Rate: Moderate
  • Spreads: Yes
  • Wildlife Support: Birds or Mammals
  • Fire-resistant: Yes
  • Edible: Yes
  • Mature Height: 6-8in
  • Mature Width:2-3ft

Black Cottonwood

Black Cottonwood (Populus trichocarpa)
Populus trichocarpa

Balsam poplar (Populus balsamifera) is the northernmost American hardwood, and grows across the continent. Though it appears in upland areas, it thrives in floodplains. It is our tallest native broad-leaved tree, and has dark grey bark. In the spring and early summer the sticky resin on leaf buds releases a strong, balsamic fragrance. It is hardy, fast-growing, and relatively short-lived, though some trees have been known to live for 200 years. Other names are balm-of-gilead, bam, tacamahac, cottonwood, or heartleaf balsam poplar.

Wildlife

The leaves of the balsam poplar serve as food for various caterpillars in the order Lepidoptera. It is an important browse for deer and elk and provides nesting habitat for large birds. The anti-infectant property of the resin is used by bees, who seal intruders in it to prevent decay and protect the hive.

Uses

A great riparian restoration species. The light, soft wood is used for paper pulp and construction lumber.


  • Light Requirements: Full Sun, Part Shade
  • Water Requirements: Dry, Moist, Seasonally Wet, Perennially Wet
  • Ease of Growing: Easy to grow
  • Growth Rate: Fast
  • Spreads: No
  • Wildlife Support: Birds or Mammals
  • Fire-resistant: No
  • Edible: No
  • Mature Height: 175ft
  • Mature Width:40ft

False Solomon’s Seal

False Solomon (Maianthemum racemosum)
Maianthemum racemosum

False Solomon’s seal is a clump-forming perennial which typically grows 2-3′ tall and slowly spreads by thick rhizomes, often forming large colonies in the wild. Features unbranched, gracefully arching stems of alternate, oval, pointed, light green leaves with conspicuously parallel veins. Tiny, fragrant, creamy white flowers appear at the stem ends in terminal, plumy, spirea-like racemes (hence the species name) in spring.

Flowers are followed by greenish berries which turn an attractive ruby red in summer, often persisting into fall unless earlier consumed by wildlife. Foliage turns yellow in fall. Foliage resembles that of the true Solomon’s seals (Polygonatum spp.), but the latter have distinctly different flowers (i.e., bell-shaped flowers which droop from the leaf axils all along the stems).


  • Light Requirements: Part Shade, Full Shade
  • Water Requirements: Moist
  • Ease of Growing: Easy to grow
  • Growth Rate: Moderate
  • Spreads:
  • Wildlife Support: Pest-eating Insects, Birds or Mammals
  • Fire-resistant: Yes
  • Edible:
  • Mature Height: 1-3ft
  • Mature Width:1-2ft

Red-osier Dogwood

Red osier dogwood (Cornus sericea)
Cornus sericea

Red osier dogwood (Cornus sericea) is a medium to tall deciduous shrub. It can grow 6-15 feet tall and 5-10 feet wide depending on site conditions, and spreads to form dense thickets. It is attractive year round with red winter twigs (especially in sunny sites), creamy-white flower clusters, red to purple fall color, and bluish-green to white fruits.

This shrub is excellent for wildlife. Painted lady butterflies visit the flowers for nectar, and spring azure butterflies lay their eggs on the newly developing leaves and buds. Dozens of species of birds and mammals rely on it for food year-round, eating the new shoots in the spring, berries in summer and fall, and twigs through the winter. Birds take cover and nest in the shrubs, and even some amphibians lay more eggs in wetlands with red osier dogwoods than without.

Cuttings readily root, and it is an excellent shrub for improving the health of stream banks and wetlands. In the wild, it commonly grows in wetlands and other habitats with damp soil.


  • Light Requirements: Full Sun, Part Shade
  • Water Requirements: Moist, Seasonally Wet, Perennially Wet
  • Ease of Growing: Easy to grow
  • Growth Rate: Fast
  • Spreads: Yes
  • Wildlife Support: Pollinators, Hummingbirds, Birds or Mammals
  • Fire-resistant: Yes
  • Edible: No
  • Mature Height: 15ft
  • Mature Width:6-9ft

Black Twinberry

Black twinberry (Lonicera involucrata)
Lonicera involucrata

Black twinberry (Lonicera involucrata) is also known as “twinberry honeysuckle”. Named for its pairs of flowers and fruits, this attractive shrub grows up to 10 feet tall. Tube-shaped yellow to orange flowers bloom April – July, followed by dark purple berries surrounded by showy red bracts. Young branches have yellow bark which age to yellow-brown.

The flowers provide nectar for hummingbirds and bumblebees, and the berries are eaten by numerous birds. Twinberry is also a food plant for the young of Gillette’s Checkerspot butterfly. This wetland plant grows best in sun or partial shade and moist soil.


  • Light Requirements: Full Sun, Part Shade
  • Water Requirements: Moist, Seasonally Wet
  • Ease of Growing: Easy to grow
  • Growth Rate: Moderate
  • Spreads: No
  • Wildlife Support: Pollinators, Hummingbirds, Birds or Mammals
  • Fire-resistant: Yes
  • Edible: No
  • Mature Height: 8-10ft
  • Mature Width:4-10ft

Mockorange

Mock orange (Philadephus lewisii)
Philadelphus lewisii

Mockorange (Philadelphus lewisii) is an elegant native shrub which grows 3-9 feet tall and has a rounded form. The long stems are red when new and fade to gray with age, the older bark shredding in small flakes. Leaves are usually oval, 1-2 inches long, and a medium green.

White flowers start appearing in clusters at the ends of stems after the plant is 3-4 years old. At the height of bloom, older plants are covered in masses of sweet-smelling flowers, which have a scent similar to orange blossoms with a hint of pineapple.

This plant is as popular with wildlife as it is with people. The indra and pale swallowtail butterflies visit it for nectar, as do hummingbirds and many other pollinators. Tiger swallowtails lay their eggs on it. Birds and small mammals eat the seeds and shelter in the foliage.

Mock-orange’s green leaves turn soft yellow in autumn, contrasting beautifully with the dark green of of evergreen huckleberry and red fall foliage of Western viburnum. Add an understory of sword fern for year-round beauty and wildlife value!


  • Light Requirements: Full Sun, Part Shade, Full Shade
  • Water Requirements: Dry, Moist
  • Ease of Growing: Easy to grow
  • Growth Rate: Fast
  • Spreads:
  • Wildlife Support: Pollinators, Pest-eating Insects, Birds or Mammals
  • Fire-resistant: Yes
  • Edible: No
  • Mature Height: 6-10ft
  • Mature Width:4-10ft

Douglas Spirea

Douglas spirea (Spiraea douglasii)
Spiraea douglasii

Also known as hardhack or steeplebush, Douglas spirea (Spiraea douglasii) is best known for its large, pink, pointy clusters of small flowers that bloom from May – July. The flower clusters turn dark in late summer and linger on the plant for months, adding visual interest.

A fast grower that can reach 10-12 feet tall in just a few years, Douglas spirea favors open sunny areas and can tolerate seasonal flooding. It can spread aggressively in moist environments, but is better behaved in drier areas.

Many butterflies visit this plant for nectar and lay their eggs on it, including pale swallowtail, Lorquin’s admiral, spring azure, and mourning cloak.


  • Light Requirements: Full Sun, Part Shade
  • Water Requirements: Moist, Seasonally Wet
  • Ease of Growing: Easy to grow
  • Growth Rate: Fast
  • Spreads: Yes
  • Wildlife Support: Pollinators, Pest-eating Insects, Birds or Mammals
  • Fire-resistant: Yes
  • Edible: No
  • Mature Height: 6ft
  • Mature Width:3-7ft
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