Usually short, fat and rounded, it has a knobby surface with growth buds, or eyes, from which the shoots of the new plant emerge. Rhizomes, which are sometimes called rootstocks, are thickened stems that grow horizontally, weaving their way along or below the surface of the soil and at intervals sending stems above ground. Spring bulbs provide early color before most annuals and perennials. One of the most popular spring bulbs is tulip. These are sold by type and variety.
Tulips come in all colors except blue.
They come in the colors of white, yellow, red, and peach, but not blue. Many have naturalized in places. Hyacinths produce a large single spike of many small, fragrant flowers, and come in a complete color range. There are no red crocuses. Selecting quality spring bulbs is very important, because the flower bud has already developed before the bulb is sold.