May: Planting & Propagation Tips


Here are some excellent tips from the produced by OSU Extension. The Oregon State University Extension Service encourages sustainable gardening practices.

  • Plant dahlias, gladioli, and tuberous begonias in mid-May.
  • Plant chrysanthemums for fall color.

Plant these vegetables (dates vary locally; check with local gardeners):

  • Oregon coast: Snap beans, broccoli, Brussels sprouts, cantaloupes, pickling cucumbers, dill, kale, parsnips, peppers, pumpkins, summer and winter squash, sweet corn, and tomatoes.
  • Western Oregon: Mid-May, transplant tomato and pepper seedlings.
  • Western Valleys, Portland, Roseburg, Medford: Snap and lima beans, Brussels sprouts, cantaloupes, slicing and pickling cucumbers, dill, eggplant, kale, peppers, pumpkins, summer and winter squash, onions, potatoes, tomatoes, and watermelon.
  • Lower elevations, eastern Oregon (dates vary widely): Snap and lima beans, beets, celery, sweet corn, slicing and pickling cucumbers, dill, kale, kohlrabi, onions, parsley, parsnips, peppers, white potatoes, pumpkins, summer and winter squash, and tomatoes.
  • Central Oregon and higher elevations of eastern Oregon: Direct seed carrots, corn (late May), chard, kohlrabi, and potatoes. Transplant Brussels sprouts, cauliflower, cucumbers (late May), leeks, or peppers.
  • Columbia and Snake River valleys, Ontario: Cantaloupes, dill, eggplant, kale, okra, peppers, sweet potatoes, tomatoes, and watermelon.

Download the May Planning Calendar

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