March: Best time to do heavy pruning of trees and shrubs.
Late March: Time to plant pansies. Also good time for first lawn fertilization of the season.
Early April: Time to prune roses.
April: Ideal time to divide and move perennials, and to remulch beds.
Mother’s Day: Generally, last date for killing frost. Time to begin planting summer flowers and to turn on irrigation system.
June 1st: Safe to put cold-sensitive tropical plants outside. Introduce them only gradually to full sun.
Late June: Time to remove pansies and other cool-weather annuals and replace with summer flowers.
Spring Bulbs: Save or Remove?
Spring-flowering bulbs are loosely categorized into two groups in our climate: those that come back reliably every year, and those that don’t.
Daffodils, Narcissus, and most hardy woodland bulbs usually return year after year, as long as their leaves are allowed to turn brown after flowering before being cleaned up.
Tulips and Hyacinths, however, don’t stay green long enough to consistently produce flowers for the following season. Two or three seasons of brilliance is all you can expect, so it’s a good idea to remove them, bulb and all, right after the second year of flowering, while you can still find them. You can then plant new ones in the fall.