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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

Office Hours:

Monday - Friday,
8:30 a.m. - 5 p.m.

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

Map to our office

K-State Research and Extension is committed to making its services, activities and programs accessible to all participants. Reasonable accommodations for persons with disabilities may be requested by contacting Johnson County Extension at (913)715-7000. Notify staff of accommodation needs as early as possible.

Kansas State University Agricultural Experiment Station and Cooperative Extension Service

K-State Research and Extension is an equal opportunity provider and employer.

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.

Return to Garden Calendar

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