35 Washington Landscaping Ideas for Seattle, Spokane & the PNW
Two completely different climates, one state. Lush PNW woodland gardens for western WA, drought-tolerant xeriscape for eastern WA — with AI design plans for any style.
Seattle & Puget Sound (Zones 8b–9a)
55" rain/year (mostly Oct–May), mild temperatures (rarely below 20°F or above 90°F), overcast winters, excellent summer weather, acidic soil
Seattle Woodland Garden
A lush woodland garden for Seattle's famous overcast climate: Japanese maples for fall color, hostas, ferns, and hellebores carpeting the ground. Hydrangeas bloom June–September in the cool maritime air.
Pacific Northwest Native Yard
Replace lawn with a true PNW native yard: sword ferns, red flowering currant, salal groundcover, Oregon grape hedges, and a Pacific dogwood as the signature specimen tree.
Seattle Modern Low-Water Front Yard
Seattle summers are dry — this design handles both: permeable gravel hardscape for rainy winters + drought-tolerant plantings (lavender, sedums, ornamental grasses) that look great all year.
Seattle Edible Rain Garden
A rain garden that captures roof runoff in a bioswale planted with edible and native plants: blueberries, elderberry, rush, and native sedges absorb water while producing food for the kitchen.
Olympic Peninsula & Western Rainforest (Zone 8b)
Up to 140" rain/year in Olympic rainforest, drier in rain shadow (Sequim: 16"/yr), Sitka spruce-western red cedar ecosystem, extremely mild temps
Rainforest Garden (Port Angeles / Forks)
Embrace the extreme moisture: giant chain ferns, devil's club (dramatic texture), skunk cabbage in wet areas, native oxalis as groundcover under western red cedar. Magical and otherworldly.
Sequim Lavender Garden
In Sequim's rain shadow, the climate is surprisingly Mediterranean. This is lavender capital of North America: rows of 'Hidcote', 'Grosso', and 'Provence' lavender, with Tuscan rosemary and santolina borders.
Olympic Peninsula Native Forest Edge
Naturalistic planting for forest edge properties: vine maple as understory tree, red alder for nitrogen fixation, ocean spray for summer flowers, native roses for fall hips.
Western WA Deer-Resistant Garden
Western WA deer eat almost everything. This garden uses reliably deer-resistant plants: Pacific wax myrtle hedge (deer hate it), lavender, catmint, daffodils, and native ferns.
Eastern Washington — Spokane & Tri-Cities (Zones 5b–6b)
Semi-arid: 17" rain/year (Spokane), hot dry summers (100°F), cold winters (-20°F possible), sandy loam soil, alkaline pH, very different from western WA
Spokane Xeriscape Front Yard
Eastern WA's semi-arid climate rewards xeriscape: decomposed granite mulch, blue grama grass, sagebrush (native to the shrub-steppe), rabbitbrush, and drought-tolerant perennials like penstemon and yarrow.
Eastern WA Perennial Border
Spokane's cold winters and dry summers suit hardy perennials: purple coneflower, black-eyed Susan, Russian sage, catmint, and ornamental onions that bloom from spring to fall.
Tri-Cities Desert Oasis
The Tri-Cities area (Richland, Kennewick, Pasco) is nearly desert at 7" rain/yr. A desert oasis design with gravel mulch, agave (zone 5-hardy Agave parryi), ornamental grasses, and a drip-irrigated shade tree.
Spokane Four-Season Landscape
Designed for Spokane's dramatic seasons: spring-blooming serviceberry and crabapple, summer rudbeckia and lavender, fall maples in red/orange, winter red-twig dogwood and evergreen mugo pines.
Cascades Foothills & Mountain Towns (Zones 5a–6a)
Short growing season, heavy winter snow, spring snowmelt flooding, acidic volcanic soil, stunning mountain views worth preserving, cold summers
Cascades Alpine Garden
Inspired by alpine meadows: creeping phlox and moss phlox bloom in spring snow, cushion plants and mounded sedums hug the ground, with Cascade mountain-ash as specimen. No lawn to mow at altitude.
Wenatchee Apple Country Garden
Wenatchee's orchard culture inspired: dwarf apple and cherry trees in the landscape, with underplanting of clover groundcover, calendula, and native bunchgrasses. Beautiful spring bloom.
Mountain Town Wildlife Habitat
Designed to coexist with elk, deer, and bears common in Cascades towns: bear-safe fruit trees (kept from yard) + wildlife-friendly natives: serviceberry, chokecherry, native grasses.
Cascades Fire-Wise Design
With WA's increasing wildfire risk in eastern Cascades, a defensible space design: non-combustible rock mulch 5–30ft from home, low-water-content plants, no dense shrubs against structure.
Best Native Plants for Washington State
PNW natives thrive in acidic soil, handle heavy rain, and support the region's native pollinators, birds, and salmon-dependent ecosystems.
| Plant | Type | Zone | Best Feature |
|---|---|---|---|
| Pacific Dogwood | Tree | 6–9 | WA state flower, spring bloom, fall color |
| Red Flowering Currant | Shrub | 6–9 | Early spring hummingbird magnet |
| Sword Fern | Fern | 3–8 | Evergreen, year-round structure, deep shade |
| Salal | Groundcover | 6–9 | Edible berries, drought tolerant in shade |
| Kinnikinnick | Groundcover | 2–6 | Fire-resistant, red berries, coastal/mountain |
| Oregon Grape | Shrub | 5–9 | Evergreen, yellow flowers, edible berries |
| Ocean Spray | Shrub | 4–8 | Foamy white summer flowers, wildlife value |
| Big-leaf Maple | Tree | 5–9 | Massive fall color, shade canopy |
Rain Garden Design Tips for Western WA
Rain gardens turn Washington's biggest landscaping challenge (too much rain) into an asset. Seattle/King County rebates available.
💧 Right size it
Size rain garden at 20–30% of the roof area draining into it. A 1,000 sq ft roof needs a 200–300 sq ft rain garden.
💧 Locate it right
Position at least 10 feet from the house foundation, in a natural low spot. Never in a septic setback zone.
💧 Plant the right species
Center: flood tolerant (rush, sedge, swamp milkweed). Edge: moisture tolerant (red-twig dogwood, native iris). Rim: drought-tolerant (lavender, yarrow).
💧 Use amended soil
Standard WA clay soil won't drain. Dig 18" deep, refill with 60% sand, 20% compost, 20% topsoil mix. Or use a professional rain garden mix.
Washington Landscaping FAQs
What are the best plants for Seattle's climate?
Seattle's mild maritime climate supports an incredibly diverse palette. Best performers: Japanese maples, rhododendrons and azaleas (thrive in acidic soil), ornamental grasses, hostas, ferns, hydrangeas, and Pacific Northwest natives like sword fern, red flowering currant, and salal. Seattle's summers are dry (only 4" June–August), so even 'wet climate' plants need irrigation in summer.
How do I landscape for Washington's rainy winters?
Key strategies: (1) Install rain gardens or bioswales to capture and slow runoff, (2) Use permeable pavers or gravel instead of solid concrete, (3) Plant with roots that hold wet soil (native plants are ideal), (4) Avoid plants that rot in waterlogged soil — plant on raised mounds if your yard pools water, (5) Clean gutters and direct downspouts away from foundation. Rain gardens can eliminate yard flooding while creating wildlife habitat.
Eastern vs. western Washington — are they really that different?
Dramatically different. Western WA (Seattle, Tacoma, Olympia): 40–55" rain/year, mild winters (rarely below 20°F), cool summers. Grow camellias, rhododendrons, Japanese maples, and lush shade gardens. Eastern WA (Spokane, Tri-Cities, Yakima): 7–17" rain/year, hot summers (100°F), cold winters (-20°F possible). Think xeriscape, sagebrush, drought-tolerant perennials, and plants suited to the Great Basin shrub-steppe. Different zones, completely different plant palettes.
What's a rain garden and do I need one in Washington?
A rain garden is a shallow planted depression that captures roof or driveway runoff, allows it to soak in slowly, and filters pollutants before they reach streams. In Washington, they're valuable in two scenarios: western WA where heavy rains overwhelm storm drains, and eastern WA where water is precious and captured water extends irrigation. Seattle and King County offer rebates up to $1,000 for qualifying rain gardens through the Clean Water program.
Are there Washington state rebates for landscaping?
Yes: Seattle Public Utilities offers rebates for removing lawn and replacing with native plants or rain gardens ($1–$3/sq ft). King County Clean Water has rain garden incentives. Ecology has grants for stormwater projects. On the east side, Spokane's Water Department offers irrigation efficiency rebates for switching from lawn to drought-tolerant landscaping. Saving Water Partnership (seattle.gov/saving-water) is the main portal for Seattle-area rebates.
How do I use an AI tool to design my Washington yard?
Yardcast's AI lets you upload a photo of your Washington yard and generate realistic transformations showing Seattle woodland gardens, PNW native conversions, or eastern WA xeriscape designs. It's free to try — no account required. You get before/after visuals plus a plant list specific to your chosen style.
Design Your Washington Yard with AI
Upload a photo and see AI-generated PNW woodland, native, modern, or xeriscape designs in seconds. Free to try.
🌲 Try Free Now →