Mid-to-late March is an ideal time to plant your cool season or spring garden.
Potatoes, broccoli, cabbage, cauliflower, onions, peas and many other crops can be planted this month.
Lettuce can also be planted. However, you will want to cover it with remay fabric (tobacco canvas).
If you haven’t started cole crops (broccoli, cabbage, cauliflower etc.) seedlings yet, you should just buy the plants in a few weeks from a trustworthy nursery. This will save you time and trouble unless you are growing a great deal of it.