University of Florida has these tips for the summer gardening including what to plant, what to do and what insects to scout for.
Annuals/Bedding plants: Plants that can take summer heat include coleus, salvia, torenia, wax begonia, and ornamental pepper. See Annuals: http://edis.ifas.ufl.edu/topic_annual_landscape_plants
Bulbs: Some lilies do better when their roots are crowded. Try planting Amazon, Aztec, and Clivia lilies in containers to increase blooming. See Bulbs for Florida: http://edis.ifas.ufl.edu/topic_bulbous_flowers
Herbs: Plant heat-loving herbs, including basil, Mexican tarragon, ginger, cumin, summer savory, and rosemary. See Herbs: http://edis.ifas.ufl.edu/topic_herbs
Vegetables: Sweet potatoes, boniato, hot peppers, and tropical "spinach" such as Sisso, Malabar, and New Zealand can be planted now. See Vegetable Gardening in Florida: http://edis.ifas.ufl.edu/topic_vegetable_gardening
Pests: Watch for thrips, scale, and mites on ornamental plants because they become more active in warm weather. See Landscape Pest Management: http://edis.ifas.ufl.edu/topic_landscape_pests
Gardenias and ixora: Distinguish between the normal yellowing of older leaves and the yellowing of new growth, which usually indicates a micronutrient deficiency. See Nutrient Deficiency (Landscape Plants): http://edis.ifas.ufl.edu/topic_nutrient_deficiencies_landscape_plants and Gardenias at a Glance: http://edis.ifas.ufl.edu/ep338
Oleanders: Inspect chewed or ragged leaves for oleander caterpillars at work. See Oleander Pest Management: http://edis.ifas.ufl.edu/topic_oleander_ipm
Lawns: Watch for damage from chinch bugs in St. Augustinegrass and begin scouting for newly hatched mole crickets in bahiagrass lawns. See Turfgrass Pest Insects: http://edis.ifas.ufl.edu/topic_turf_pest_insects
Tomatoes: Watch for pests, disease, and nutritional disorders on tomato plants. See Home Tomato Gardening: http://edis.ifas.ufl.edu/topic_tomato_gardening
Trees: Prepare for hurricane season by checking trees for damaged or weak branches and prune if needed. Hire an ISA-certified arborist. See International Society of Arboriculture: http://isa-arbor.com/ and Pruning Landscape Trees and Shrubs: http://edis.ifas.ufl.edu/topic_tree_pruning
Lawns: Prevent or minimize disease by following proper cultural practices when caring for lawns. See Turf Diseases: http://edis.ifas.ufl.edu/topic_turf_diseases
If you would like a gardening recommendation from a Palm Beach County Cooperative Extension Master Gardener Volunteer call 233-1750. M-F 9-4