Few garden activities are as satisfying as harvesting root crops. Grasping the green aboveground shoots and pulling to reveal the treasure beneath the soilthis is one of gardening's finest moments. And root crops are easy to grow in loose, well-worked, rich garden soil. Direct-sow the seeds for these are cool-season crops in early spring or late summer; they'll mature in the chilly weather of spring and fall. And enjoy your "hidden" harvest of nutritious, delectable root vegetables.