April Garden Checklist
Depending on citrus fertilizer label, apply fertilizer every six weeks or as directed. Check for citrus insects; apply horticulture oil if insects are detected. Check for diseases; apply fungicide just at new leaf flush or after bloom drop. Maintain 2-3' unmulched area just outside the root ball (which would be 12-18 inches away from the trunk).
Weed as needed. Apply Azalea fertilizer to blueberry shrubs, at 1/2 pound per 3' of shrub. Granular fertilizer may require about 1/4 inch of water to allow the root to absorb the nutrients.
Annuals to plant now include celosia, coleus, coreopsis, dusty miller, geraniums, hollyhocks, impatiens, kalanchoe, lobelias, marigolds, portulacas, rudbeckias, salvia, verbenas, zinnias. Groom to reshape perennials. Prune hard to correct growth problems. Divide overcrowded fall flowering perennials and bulbs. Bulbs to be planted now include achimenes, agapanthus, amaryllis, Asiatic lilies, begonias, blood lily, caladiums, cannas, crinum, dahlia, gladiolus, gloriosa lily and zephyranthes.
Anise, basil, bay laurel, borage, caraway,cardamom,chervil, chives, coriander, culantro, cumin, dill, garlic, ginger, horehound, lemon balm, lavender, marjoram, Mexican tarragon, mint, nasturtium, parsley, oregano, rosemary, sage, sesame, and thyme can be planted now.
Begin watching roses for black spot fungus disease, small black spots on the leaves can quickly worsen. Continue spray program. Water as needed. April 15, apply granular rose fertilizer. Cut and remove spent blooms.Check for spider mites (wash underside of leaves with strong water pressure). Add mulch, 2-3 inches deep (oak leaves, cedar pine straw).
Water during early morning when the leaves curl and turn gray-green. Reduce fertilizers and pesticides during seasons of drought. Keep mower height at the highest setting for grass type. Apply no more than 1 inch of sand to uneven areas for leveling. Allow grass clippings to stay on the lawn as long as grass is healthy.
Most older trees and palms are fine and can exist with the seasonal rains. Look for aphid, borer, and scale infestations. Caterpillars may be extra heavy this month. Continue fertilizing palms as needed.
This month you can plant snap beans, pole beans, lima beans, cantaloupe, collards, corn, cucumbers, eggplant, kohlrabi, okra, Southern peas, pumpkin, peppers, squash, sweet potatoes, tomatoes, turnips, watermelon, and yams.
Selected from Florida Vegetable Guide by JM Stephens, RA Dunn, G Kidder, D Short, & GW Simone, University of Florida and Month-by-Month Gardening in Florida by Tom MacCubbin