With careful attention to soil preparation, plant variety selection and planting dates many vegetables can be successfully grown in the Pacific Northwest. Challenges to the Pacific Northwest vegetable gardener include a short growing season in many areas, temperature extremes that can range over one hundred degrees from summer to winter, and climate conditions that are moderate and humid in the west and hot and dry in the eastern portions of the area. The Pacific Northwest growing season is also variable with almost 250 growing days along the coast to just 90 days in the higher elevations.
Find out the hardiness zone for your area of the Pacific Northwest. Most vegetable gardeners find that the Sunset climate zones more accurately reflect their garden growing needs that the more general USDA Hardiness Zones. In the Pacific Northwest, there are five Sunset Climate Zones.
Clear the area where you want to grow vegetables making sure that the site receives maximum sun hours and is relatively level. A north-south orientation provides the best sun exposure for vegetable gardens.
Get a soil test. Collect soil into a plastic bag from several locations and depths in your garden and mix thoroughly. Get your soil test done several months before planting to allow time to receive the report and add amendments to the soil as needed. The agricultural extension office associated with your state university provides soil testing for a small fee.
Prepare garden soil. Add amendments to improve soil nutrition emphasizing organic matter that has been decomposed and a balanced fertilizer. Till the soil down several inches and mix the organic matter into the soil. It is likely that your soil test will suggest adding lime to raise the soil pH. Washington State University Extension Service recommends using raised beds for vegetable gardening in the Pacific Northwest to promote drainage.
Get a planting schedule for vegetables in your Pacific Northwest zone. In general, cool weather crops can be planted in early spring and warm weather crops in late spring although the exact time will vary by location. Salad greens can continue to be planted throughout summer for a constant vegetable crop until freezing temperatures return.
Plant your seeds or seedlings in the prepared soil using a trowel for seedlings and broadcast for seeds. Leave space around plants for paths to harvest vegetables without compressing the soil or size your raised beds so that any plant can be reached from outside the garden for harvesting. For shorter growing season areas, use transplants or start seeds indoors before placing plants in the soil.
Tap soil gently around the plants or seeds and water.
Add a small amount of liquid fertilizer and mulch around the base of plants to limit competition from weeds for nutrients and water.
Harvest vegetables when they are ripe.