Great question - and it all depends. If you have raised beds or well drained soil than March is a good time to seed cool season crops like peas, lettuce, kale, and spinach. We still will get frosty nights until May 1, so no warmth loving plants like tomatoes, eggplant, cucumbers or squash. Some flower seeds like sweet peas, poppies and alyssum can go into the ground now. Keep growing, Marianne Binetti