Here are some things you can do/plant to keep up and improve your spring garden:
Get cool-season crops such as spinach, turnips, mustard, beets, carrots, and broccoli into the garden now. Don't wait—soon the weather will be too hot for them.
In mid-to late March, plant corn, peppers, squash, tomatoes, and cucumbers.
Pull mulch away from perennials, shrubs, and trees to allow the soil to warm around them.
Plant carnations, daisies, marigolds, petunias, and snapdragons.
Plant peas later in the month or when a week of warm weather is forecasted. Plant them outside in a sunny spot.
Plant a new strawberry bed or rejuvenate an old one by replacing about a third of the plants.
At the end of the month, fertilize the lawn.