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Johnson County

Research-based Information You Can Trust — Localized for your needs

Johnson County
11811 S. Sunset Drive
Suite 1500
Olathe, KS 66061

(913) 715-7000
(913) 715-7005 fax

Map to our office

March Garden Calendar

Vegetables and Fruits

  • Prepare soil for spring planting.
  • It is best to perform a soil test before fertilizing to determine needs. If there are no soil test results, fertilize the garden with 1 to 2 pounds of 10-10-10 per 100 square feet.
  • Plant:
  • Potatoes, peas, onions, lettuce and other salad crops.
  • Asparagus, rhubarb, and strawberries.
  • Broccoli, cauliflower, and cabbage in late March.
  • Start seeds inside for tomatoes, peppers, and other warm season vegetables.
  • Apply dormant oil to fruit plantings to reduce scale and mite insects.
  • Make a fungicide application to control peach leaf curl.
  • Finish pruning fruit trees, grapes, raspberries, and blackberries.
  • Remove mulch from strawberries when growth begins.


  • Plant pansies, snapdragons, calendulas, and other cool-loving annuals.
  • Clean up the perennial bed by cutting back foliage and removing winter mulch layer. Divide and plant perennials in the garden.
  • If dry, prepare soil for planting by adding compost or other organic matter.
  • As growth begins, fertilize gardens with a balanced fertilizer.
  • Start seeds indoors under lights for transplanting to the garden.
  • Plant new roses. Remove winter mulch from existing roses and prune.
  • Cut ornamental grasses back to within 3 to 5 inches of the ground.
  • Fertilize spring flowering bulbs such as tulips and daffodils.
  • Cut seed pods from spent bulbs.
  • Help control iris borers by destroying old foliage before new growth begins.
  • Unwrap mail order plants immediately and keep them cool and moist until planting.


  • Spot spray for dandelions, henbit and chickweed.
  • Apply crabgrass preventer in late March through mid-April for best results.
  • Seed thin areas in bluegrass and tall fescue lawns.
  • If no fall application of fertilizer was made, fertilize bluegrass and tall fescue.
  • Mow grass ½ inch lower to remove winter debris. Do not scalp.

Trees and Shrubs

  • Pruning:
    • Prune trees, except birch, maple, and walnut, which are best pruned after leafing out.
    • Wait to prune spring flowering shrubs until after they bloom.
  • Mulch tree and shrub plantings up to 4 inches deep, keeping mulch away from trunks.
  • Fertilize trees and shrubs.
  • Plant new trees in the landscape.
  • Remove tree wraps from young trees for summer growth.
  • Rake and clean groundcover plantings.


  • Sharpen and repair garden tools.

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K-State Research and Extension Johnson County Master Gardener logo

Have questions? The Garden Hotline is staffed by trained EMG volunteers and Extension staff who will assist you with questions.

Phone: (913) 715-7050

Email: garden.help@jocogov.org