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Concept

Pacific Northwest Gardening

Also known as: PNW gardening, Cascadia gardening

The bioregional gardening tradition of the U.S. and Canadian Pacific Northwest — coastal Oregon, Washington, southern British Columbia, with extensions inland. Mild winters (zones 7b–9a west of the Cascades), cool summers, dramatic wet-dry seasonal split, and exceptional growing conditions for cool-season vegetables, berries, brassicas, alliums, and Pacific Rim crops. The climate has shaped a distinctive horticultural culture — including Carol Deppe's resilience tradition, the Adaptive Seeds and Wild Garden Seed open-pollinated lineages, and the regional specialty of year-round-greens gardening.

The Pacific Northwest west of the Cascades is one of the most temperate gardening climates in North America — cool, wet winters; cool, dry summers; long shoulder seasons; substantial cool-season crop production through much of the year. East of the Cascades the climate is dramatically different (drier, hotter summers, colder winters), and the gardening practice changes accordingly.

This entry focuses on the maritime PNW; the interior PNW has gardening conditions more similar to the northern Great Plains.

Climate and soil (maritime PNW)

  • USDA zones: 7b–9a depending on latitude and exposure to ocean influence
  • Last frost: late February to early May
  • First frost: late October to mid-November (some coastal areas frost-free)
  • Frost-free season: 200–300 days
  • Summer: cool to warm (rarely sustained 90°F+); dry from June through September
  • Winter: mild, wet, rarely sustained freezing temperatures
  • Rainfall: 25–80+ inches annually, heavily concentrated October–April; summer effectively dry
  • Native soils: variable — glacial outwash sands and gravels, alluvial river-bottom soils (extremely productive), volcanic-influenced soils in some areas

What grows exceptionally well

  • Brassicas (broccoli, cabbage, cauliflower, kale, collards, Brussels sprouts): nearly perfect climate; cool summers + mild winters allow continuous production
  • Salad greens: year-round; the climate is essentially custom-built for lettuce and similar crops
  • Alliums (onion, leek, garlic, scallion): superb growing conditions, especially for storage varieties
  • Berries (strawberry, raspberry, blueberry, currant, gooseberry, blackberry): the region’s signature fruit production
  • Tree fruits (apple, pear, plum, cherry, peach in milder areas, fig): excellent
  • Peas and broad beans (favas): cool-season favorites
  • Asian leafy greens (mizuna, mibuna, tatsoi, choi sum): superb
  • Cane berries, currants, hazelnuts: regional specialties

What requires special care

  • Heat-loving crops (tomato, pepper, eggplant, melon, sweet corn): possible but marginal in coolest areas; favor early-maturing, cool-tolerant varieties; consider greenhouse or hoop-house culture
  • Beans and corn: need the warmest part of summer; succession-plant with caution
  • Wet-spring crops: get cold and wet seedbeds in March–April; transplant rather than direct-seed where possible

Specific regional practices

  • Hoop houses very popular for the heat-loving crops; the marginal-heat climate makes them more valuable than in hotter regions
  • Mulching for moisture retention in dry summers — summer drought is the principal water-management challenge
  • Cover-crop choices favor overwintering species (vetch, rye) given the mild winters
  • Slugs are the persistent regional pest; multiple management strategies (iron phosphate baits, beer traps, dry-mulch zones, encouraging ducks and toads)
  • Variety selection — the Adaptive Seeds, Wild Garden Seed, and Uprising Seeds catalogues represent open-pollinated PNW-adapted variety work; Carol Deppe’s variety releases also fit here
  • Year-round salad culture — distinctive regional practice; lettuce production continues through much of winter under minimal cover

Notable regional institutions

  • Oregon State University Extension — particularly strong publications on PNW vegetable production
  • Washington State University Extension — same
  • Seed Savers Exchange (national but with strong PNW network)
  • Adaptive Seeds, Wild Garden Seed, Uprising Seeds — regionally-adapted seed houses
  • Common Ground Garden (Ecology Action, biointensive) at Willits, California — Mediterranean-climate adjacent

Where it sits in this wiki

PNW gardening is one of the bioregional gardening pages, alongside [[mid-atlantic-gardening|Mid-Atlantic gardening]], [[cold-climate-gardening|cold-climate gardening]], and others. It cross-references [[carol-deppe|Carol Deppe]] (the principal modern PNW gardening writer) and the [[seed-saving|seed-saving]] tradition the region has fostered.

See also

Auto-generated from this entry’s typed relations: frontmatter, grouped by relation type so the editorial signal isn’t flattened.

  • Subset of: [[gardening]]
  • Pioneer of target: [[carol-deppe]]

Sources

  • Oregon Vegetable Production (Oregon State University Extension)
  • Carol Deppe, The Resilient Gardener — extensively tuned to PNW
  • Various Master Gardener publications from WSU and OSU

Rooted in life.

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