Vegetable Garden Checklist for the End of March
Plant Potatoes and Onions

Add Compost or Fertilizers
Work your compost into the top two inches of garden soil and replenish your beds. If you are using fertilizers be sure to use natural fertilizers that won't add salts to the soil. Pay attention to the rating on the side of each fertilizer. When growing greens higher nitrogen is good but not so much when wanting fruit from tomatoes or peppers. The NPK ratio should match what you're growing. NPK stands for Nitrogen, Phosphorus, and Potassium which are the three major elements plants need for growth.
Weed Control

Garden Cleanup
If you have anything left that needs cleaned up do it now before things really get growing!
Build New Raised Beds
Anytime is a good time to build a raised bed! The best thing about a raised bed is that you have the ability to control the soil quality. Always avoid soil that may be contaminated with weeds as the seeds or roots may grow and create problems later. This post may be helpful if you need more information on designing a garden with raised beds.
Mulch
Spread a good layer of mulch over the garden for good moisture control and to add organic matter. A layer of newspapers underneath can add some extra weed protection. Good garden mulches should be organic and let water through but keep the sun off the soil. Straw is commonly used in the garden but I've had good success with hardwood mulch, pine straw, grass clippings, and leaves.
Plant Seeds
Cool season plantings can be direct sowed in the ground or planted in pots indoors to transplant out. Radishes, lettuce, kale, chard, spinach, parsley, cilantro, arugula, beets, and many others!
Plan Your Plantings for Succession Planting
What are you going to put next in that garden bed? You need to know! Follow a basic crop rotation plan to avoid soil disease and minimize nutrient depletion.
How much of this list do you have completed?