When it comes to fertilizing vegetables, you can group them into 3 categories: light, moderate and heavy feeders. Peas, beans, radishes, turnips and mustard greens among the light feeders. Give them starter fertilizer when you plant; if they’re growing in compost-enriched soil, they probably won’t need to be fed again. For best results, do a soil test before planting to determine what kind of amendments and fertilizer your soil needs. Shown here: Snow Pea 'Green Beauty'