Plant pansies.

Working wet soil destroys the soil structure, so wait until it dries out to dig, rototill, or even walk on.  If not, your soil will compact so harshly that later in the year, it will be packed hard -- not a good growth environment.

Complete tree pruning. Do not prune trees during new leaf growth

Apply Espoma Organic Traditions Garden Sulfur to soils around acid-loving plants (Azaleas, Rhododendrons, Hollies and Dogwoods)

When new growth appears in perennial beds, apply a balanced fertilizer like Osmocote.

Prune ornamental grasses to 6-8 inches.

Prune shrub roses (not climbing roses), butterfly bushes, crape myrtle.

Clean up and dispose of all diseased foliage from roses, peonies, iris and daylilies. These are subject to fungal leaf diseases.

Summer and fall-blooming perennials can be divided now.

It's a good time to prohibit new weed growth with Miracle-Gro's Shake 'n Feed All Purpose Plant Food Plus Weed Preventer.