As gardens move toward spring's bountiful bloom, it's time to replace declining fall and winter blooming annuals with their spring and summer counterparts. Look in nurseries for six packs or 4-inch pots of colorful coleus, cosmos, verbena, marigolds, petunias, vinca, celosia, and other favorite annuals. Popular heat-loving perennials also can be planted now, including lavenders, kangaroo paws, sages, pincushion flowers (Scabiosa), asters, penstemons, heliotropes, artemisia and African daisies.