Spring is springing. Here are some tasks in April for Treasure Valley gardening:
Shear back groundcovers and wake up your flower beds with a general fertilizer.
Prune roses when forsythia blooms. Fertilize.
Protect tender plants from frost.
When the forsythia blooms, use crabgrass pre-emergent chemical or a corn-gluten meal treatment to prevent crabgrass.
Plant conifers, trees and shrubs. Also plant summer bulbs: alliums, cannas, hostas and daylilies.
When daffodils bloom, plant parsnip seeds.
Prune buddleias, shrub dogwoods and caryopteris.
Prune lavender to shape as it shows signs of new growth.
Begin hardening off indoor seedlings to acclimate them to outdoor life. Shelter tender seedlings from wind.
Watch for aphids and knock them from plants with a blast of water. Beneficial insects will take over soon.
Set up supports for peonies, delphiniums and other "floppers."