Colorado Gardening

Colorado Gardening

by Heidi Estes, May 26, 2016

Make your garden truly enchanted this year. Learn how to create the Colorado garden of your dreams with these helpful gardening tips from Colorado State University.

Mid-MayScreen Shot 2016-05-26 at 2.23.20 PM

It’s time to . . .

  • Check for insects, especially whitefly, on purchased plants.
  • Prune spring-flowering shrubs, if needed, right after they have finished flowering.
  • Shape pine by snapping off a portion of new growth “candles”. When the time is right, they snap off easily. CSU Fact sheet 7.205
  • Plant summer bulbs, such as gladiolus and canna, now. Sprinkle 5-10-5 fertilizer in holes before inserting bulbs.
  • Plant basil, cosmos, four o’clock, portulaca, alyssum, cleome, sunflower and other annual seedlings or seeds outdoors.
  • Stake taller perennials, like peonies and delphiniums, before they start to flop.
  • Plant container roses.

Screen Shot 2016-05-26 at 2.21.54 PM Late May

It’s time to . . .

  • Harvest asparagus stalks larger than 3/8 inch until about the end of June. Cut just at soil level.
  • Transplant tomatoes when the soil is warm. A good tomato transplant will be at least as wide as it is high with a pencil-thick stem and six to eight dark-green leaves. Set plants one inch deeper than in the pot or in a shallow trench with the stem horizontal.
  • Plant corn, bean, pumpkin, squash, cucumber, and early-maturing melon seeds now if the soil is warm.
  • Plant eggplant and pepper plants only if the soil has reached at least 50 degrees.
  • Fertilize lawn now or during the first week in June. Use one pound of actual nitrogen per 1,000 square feet.
  • Fertilize roses once they have leafed out. Follow recommended rate instructions exactly.

Source  Colorado State University



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