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This is the time to plant warm-season annual and perennial flowers outdoors either by seeds or transplants. If you weren't able to take advantage of fall planting, fill all beds and pots with warm-season flowers now.
Continue to feed container-grown flowers with liquid fertilizer for growth and bloom.
Fertilize cool-season flower beds with a granulated fertilizer if you see a slowdown of growth or flowering. Water it in well afterward. Deadhead flowers to keep them blooming.
Though nurseries are filled with cool-season flowers such as primroses, calendulas, nemesia, and violas, wise gardeners remember that these are the flowers that should have been planted in fall.
Planted now, for the most part cool-season flowers will give only a short season of bloom — especially inland. The height of their bloom season is April, though in coastal gardens some will last through May.
 Stock, snapdragons, calendulas, and Iceland poppies are not the best choices to plant right now. Heat or disease knocks them down fast.
Pansies, polyanthus primroses, cyclamen, and violas can be popped into blank spots, but don't fill whole beds. Polyanthus primroses and small-flowered cyclamen will bloom through June in cool coastal gardens, however, and can be kept alive to bloom another year. And newer varieties of small-flowered pansies are floriferous and heat tolerant. They may last into August.
If you're filling whole beds, prepare the ground thoroughly and choose mainly warm-season flowers.
Good choices among annual flowers to plant now from pony paks, for color in sunny spots all summer long, include ageratum, marigolds, cosmos, sweet alyssum, verbena, salvia, petunias, and nierembergia.
An incredible amount of perennials can be put in now, including achillea, agapanthus, perennial alyssum, campanulas, candytuft, carnations, columbine, coreopsis, coral bells, daylilies, delphiniums, dusty miller, dianthus, marguerites, gaillardia, geum, penstemon, perennial forget-me-nots, Pride of Madeira, statice, and Shasta daisies.
Many of these perennials and annuals make great cut-flowers as well, including cosmos, carnations, columbine, coreopsis, coral bells, daylilies, delphiniums, and Shasta daisies. In semi-shade put in transplants of begonias, lobelia, impatiens, coleus, and fuchsias.
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