Garden Calendar for May

Zones 1-3

 

Trees & Shrubs

  • Apply 7.5 to 10 cm (3-4 inches) of mulch to shrub beds.
  • Prune water sprouts from crab apples and other trees.
  • Remove supports from trees that have been in the ground a year.
  • Snap off all new 'candles' from Scotch pines, firs and other conifers to encourage compact shape
  • After forsythia, spirea or other fountain-shaped shrubs have flowered, cut 1/3 of the oldest canes to the ground

Perennials & Bulbs

  • Keep new plantings well watered.
  • Apply water-soluble fertilizer to get new plantings off to a good start.
  • Complete new plantings.
  • Complete dividing and replanting of overgrown or crowded plants.
  • Allow foliage of early-flowering spring bulbs to dry out before you remove it.

Roses

  • As leaf buds swell and open, remove winter protection and note which cultivators are most damaged.
  • Plant bare-root roses. Plant container roses anytime from now until July.
  • When shoots are 2.5 cm (1 inch), prune ever-blooming and mini roses.
  • Lightly prune ever-blooming climbers, leaving main canes alone.
  • Remove winter-killed wood from old garden roses, but don't thin out or shape at this time.

Lawn

  • Fertilize lightly with a 2-1-1 ratio fertilizer if lawn growth is poor.
  • Establish regular mowing schedule. Never cut more than 1/2 of the leaf.
  • Watch for fungus diseases.
  • Watch for insect damage from cut worms, grubs and ants.
  • Give 2.5 cm (1 inch) of water per week with one deep soaking if weather is dry.

Vegetables & Herbs

  • Sow cool-season vegetables early this month. Make succession plantings of radishes, lettuce and spinach. Late in the month, direct-seed beans and other warm weather crops.
  • Transplant seedlings of cucumbers, melons, squash, and peppers. Water with a high-phosphorous fertilizer. Water through black plastic mulch and protect with floating row covers.
  • Plant hardy herbs. Start basil inside.
  • Harvest rhubarb and asparagus.

Annuals

  • Prepare beds by adding organic matter,lime and fertilizer as needed.
  • Plant out half-hardy plants after danger of severe weather has passed.
  • Put out containers of seedlings on warm days to harden them off before transplanting.
  • Apply pre emergent herbicides to reduce spring-germinating weeds.
  • Weed, water and fertilize as needed.

Patio & Container Plants

  • Put out over wintered or newly planted containers as weather permits.
  • Sink empty pots into large planters to hold seasonal plants such as spring bulbs, summer annuals and fall mums.
  • Be prepared to protect tender plants from surprise late frosts.

Tomatoes

  • Till bed regularly until transplant time to control weeds and aerate soil.
  • Apply black or clear plastic mulch 1-2 weeks ahead of transplanting time to help warm the beds.
  • Harden off plants in a cold frame or on an unheated porch 7-10 days before transplanting out.
  • Apply high-phosphorus fertilizer at plating time.
  • Be ready to protect transplants from surprise frosts.
  Navigation: Home |About Paint | Alberta Gardening|Contact Us| |Gardening FAQ|Home Decorating |Indoor Gardening|Paint Problems|Seasonal Florals