Vegetable gardeners grow beets for their red roots and green tops. These cool-season root vegetables are also pickled. Beet seed can be sown in the spring for an early summer harvest or in the late summer for a fall harvest. Beets grow best when planted in full sun (six or more hours of direct sunlight daily) and in well-drained soil. You can improve your soil by mixing compost into it. To speed up germination, many gardeners soak beet seeds in lukewarm water overnight before sowing into the garden. When selecting what beet seed packets to buy online, start by deciding how you want to use them. Some are tops for fresh eating, while others are preferred for canning and pickling.