While most flower bulbs require some winter chill and should be planted in fall, there are some spring options available. Many of these are bulbs, tubers or corms that are either frost-sensitive or fast growers that will provide color in the late summer through early fall. Spring bulbs may be used to extend the season of blooms, as these bulbs should begin flowering shortly after fall-planted bulb blooms are spent.
Also known as Lily of the Nile, agapanthus (Agapanthus) may be planted in the spring as soon as the ground is workable and should produce blooms by fall. Agapanthus is hardy in U.S. Department of Agriculture (USDA) Plant Hardiness Zones 7 to 10 and has long, strap-like leaves that grow like a fountain. The foliage is evergreen. Balls of small star-shaped purple or white flower clusters are produced at the tops of slender stems that may reach 2 1/2 feet tall. Agapanthus should be planted in full sun to light shade and require moderate water once established.
Hardy in most zones, and used as annuals in many cases, begonias (Begonias) are flower garden staples that also make good potted plants. Begonias grow from tubers, elongated bulbs, and should be planted just below the soil level in spring for flowers all summer long. There are hundreds of varieties of begonias, which have foliage ranging in color from bright green to multicolor. Some varieties produce large, round blooms while others produce clusters of smaller blooms. Colors include reds, pinks and whites. Begonias should be planted in filtered shade and perform best in moist soil and humidity. Some begonias are hardy to USDA Zone 6, but most should be dug up and stored over the winter in Zones 8 and below.
Caladium (Caladium) is grown for its colorful foliage, which can be green with bronze, green, pink, red, silver or white blotches. A tuber, caladium is suitable for spring plantings, as it grows quickly. These plants are perennial once established and thrive in climates with high heat and humidity. Caladium are shade-loving plants that require ample water. Bulbs should be planted just below the soil line and may be removed and stored for the winter in USDA Zones 8 and below.