August is one of the most productive planting months in Florida, despite being the hottest and wettest time of year. While gardeners in cooler states are harvesting their summer crops and winding down, Florida growers are gearing up for the fall season by getting warm-season vegetables, herbs, and flowers into the ground. The trick is knowing which plants thrive in the brutal heat and which benefit from a head start indoors before cooler weather arrives.
Warm-Season Vegetables That Go Straight Into the Ground
August soil temperatures in Florida typically sit well above 80°F, which rules out anything that prefers cool conditions but is perfect for heat-loving crops. Southern peas (also called cowpeas or black-eyed peas) are among the most reliable August plantings across the entire state. They handle the heat, tolerate Florida’s sandy soils, and actually improve soil quality by fixing nitrogen. Lima beans and yard-long beans also perform well when planted in August, as do okra and seminole pumpkin, a Florida heirloom that shrugs off the humidity that destroys many other squash varieties.
Sweet potatoes planted in August still have time to develop a good crop before the first cool snap in North Florida, though Central and South Florida gardeners have an even wider window. Cherry tomatoes and heat-tolerant tomato varieties like ‘Solar Fire’ and ‘Florida 91’ can go into the ground in South Florida toward the end of the month, but gardeners in the northern part of the state should wait until September for tomatoes. Peppers, both sweet and hot, are another strong August option across most of the state. They actually produce better when planted during the warm season rather than being forced to fruit in cooler months.
Eggplant is worth considering if you missed the spring window. It loves heat, and an August planting in Central or South Florida gives you harvests well into the fall. Watermelon and cantaloupe can still be planted in South Florida, though most of the state is running out of time for full-size melons. If you want a fast turnaround, radishes germinate in days and can be harvested within a month, though they perform better once nighttime temperatures start to ease in September.
Starting Cool-Season Crops Indoors
The real strategic move in August is seed starting. Many of Florida’s best fall and winter crops, like tomatoes, peppers, broccoli, cauliflower, and cabbage, need several weeks of indoor growth before they are ready for transplant. Starting seeds indoors or in a shaded area during August means your transplants are ready to go into the garden in September or October, when conditions are ideal for cool-season production.
Tomato seedlings take about six to eight weeks from seed to transplant-ready size. If you start them in early August, they will be sturdy enough to plant out in late September or early October, which is the prime fall tomato window for most of Florida. The same timeline applies to peppers, which are notoriously slow germinators and benefit from the extra lead time. Broccoli, cauliflower, collards, and kale seeds started in August will be ready for the garden just as temperatures dip into the range these crops prefer.
One practical consideration: seedlings started in August need protection from the afternoon sun and from Florida’s daily thunderstorms. A covered porch, a shade cloth structure, or even a well-lit indoor spot near a window works. The goal is to keep them from cooking in direct sun while still giving them enough light to grow stocky rather than leggy.
Herbs That Handle the Heat
August is a challenging month for herb gardening in Florida because many popular culinary herbs, like cilantro, parsley, and dill, bolt almost immediately in high heat. But several herbs do well when planted now. Basil is the standout performer. It loves heat and humidity, and an August planting will produce abundantly through the fall. Thai basil, lemon basil, and African blue basil are even more heat-tolerant than the common sweet basil varieties.
Lemongrass, rosemary, and Mexican tarragon (a heat-tolerant substitute for French tarragon) all handle August conditions well. Culantro, sometimes called recao or sawtooth herb, is a tropical alternative to cilantro that actually prefers the heat and shade that would kill its more temperamental cousin. Mint thrives year-round in Florida and will spread aggressively if not contained in a pot. The University of Florida’s extension service has documented the range of culinary herbs suited to the state’s climate, and most tropical and subtropical herbs perform best when established during the warm months rather than during the cooler winter season.
For herbs that need cooler weather, like cilantro, dill, and chervil, August is too early to plant outdoors, but you can begin planning and preparing beds. These go into the ground in October or November across most of Florida. Trying to rush them into August soil is a waste of seed.
Flowers and Ornamentals for Late Summer
Florida’s ornamental options in August lean heavily toward tropical and heat-tolerant species. Zinnias are a top choice: they germinate quickly, bloom within weeks, and attract pollinators throughout the fall. Sunflowers planted in August will flower before the end of September. Celosia, pentas, lantana, and portulaca all handle August’s heat without complaint and will continue blooming well into the cooler months.
Container gardening is a strong option for ornamentals in Florida, especially because containers can be moved into shade during the worst afternoon heat. Trials conducted at the University of Florida’s Mid-Florida Research and Education Center in Apopka have evaluated various flowering species under Central Florida conditions, demonstrating that plants like snapdragons and pansies can thrive in containers with proper management, though those particular species perform best once temperatures cool later in the fall and winter.1EDIS / University of Florida. Container Flowers for Central Florida: Trial Results and Recommendations: ENH1388/EP652 For August specifically, stick with tropical bloomers in your containers and save the cool-season flowers for later.
Caladiums, which are already in the ground from spring plantings, are at their peak in August, and if you missed the earlier window, you can still plant bulbs now for a shorter display. Coleus, both sun and shade varieties, can be planted from cuttings or transplants in August and will fill beds quickly. Torenia, sometimes called wishbone flower, is an underused shade-tolerant annual that handles Florida’s summer humidity beautifully.
Preparing Soil Before Fall Planting
August is arguably the best month in Florida to prepare garden beds for the fall season, and soil solarization is one reason why. The technique involves covering moist, tilled soil with clear plastic sheeting and letting the sun cook it for four to six weeks. Florida’s August sun pushes soil temperatures under plastic high enough to suppress weeds, reduce fungal pathogens, and knock back nematode populations.
Root-knot nematodes are one of the most persistent soil pests in Florida gardens. These microscopic worms attack plant roots, causing knobby galls that stunt growth and reduce yields. Research conducted in Florida has shown that solarization alone can be effective, though combining it with other methods strengthens the results. A study on raised-bed vegetable production found that solarization combined with organic amendments and adequate irrigation was effective for root-knot nematode management in double-cropped systems, offering a viable alternative to chemical fumigation.2Crop Protection. Impact of anaerobic soil disinfestation combined with soil solarization on plant–parasitic nematodes and introduced inoculum of soilborne plant pathogens in raised-bed vegetable production Another Florida-based study found that solarization alone sometimes allowed nematode populations to rebound, and that combining it with steam treatments or other controls produced more lasting suppression.3PubMed Central. Evaluation of Steam and Soil Solarization for Meloidogyne arenaria Control in Florida Floriculture Crops
If you are not solarizing, August is still a good time to work compost and organic matter into sandy Florida soil. The summer rains help break down amendments, and by the time you are ready to transplant in September or October, the soil biology has had a chance to stabilize. Adding two to three inches of quality compost to sandy beds makes a noticeable difference in water retention and nutrient availability for fall crops.
Cover Crops as a Summer Strategy
If some of your garden beds are not being planted this month, putting in a cover crop is one of the smartest things you can do. Sunn hemp is the go-to summer cover crop for Florida vegetable growers. It grows rapidly in heat, fixes nitrogen in the soil, and produces substantial biomass that can be chopped and turned under before fall planting.4EDIS. Sunn hemp (Crotalaria juncea L.): A summer cover crop for Florida vegetable producers A thick stand of sunn hemp also suppresses weeds and can reduce nematode pressure, making it a multi-purpose tool for gardeners dealing with Florida’s sandy, pest-prone soils.
Other cover crop options for August include iron clay cowpeas and sorghum-sudangrass, both of which tolerate the heat and add organic matter when turned under. The key is to plant cover crops early enough in August that they have at least six to eight weeks of growth before you need to clear the bed for fall transplants. If you wait until September, you lose much of the benefit.
Regional Differences Across the State
Florida spans USDA hardiness zones 8b through 11a, and what you plant in August depends heavily on where you are. The state is so long, stretching roughly 450 miles from Pensacola to Key West, that gardeners at opposite ends are essentially operating on different calendars.
In North Florida (roughly Jacksonville, Tallahassee, and the Panhandle), August is the beginning of fall garden preparation. You can direct-sow warm-season crops like southern peas and okra, but the main activity is starting seeds indoors for fall transplants. The first frost in this region can arrive as early as mid-November, so timing matters. Broccoli, cabbage, and cauliflower seeds started in early August will be transplant-ready just in time.
Central Florida (Orlando, Tampa, and surrounding areas) has a wider window. August direct-sowing options expand to include peppers, eggplant, and some tomato varieties alongside the standard warm-season crops. The frost risk is lower and later, pushing into December or January for most years, which means fall crops have more growing time. This is also where container flower trials have shown strong results for species that can handle the region’s warm winters.
South Florida (Miami-Dade, Broward, Palm Beach, and the Keys) operates almost like a tropical calendar. August is planting time for tomatoes, peppers, squash, cucumbers, and beans, and the growing season extends deep into winter or even year-round for some crops. Frost is rarely a concern south of Lake Okeechobee, so the limiting factor is summer heat rather than winter cold. South Florida gardeners can also plant tropical fruits and vegetables that would be impossible further north, including calabaza squash, boniato (tropical sweet potato), and malanga.
Dealing With August’s Biggest Challenges
Planting in August means working around three constant problems: extreme heat, daily thunderstorms, and insects at their peak populations. Each requires a practical response rather than just patience.
Heat stress kills more transplants in August than any disease. If you are setting out new plants, do it in the late afternoon or on a cloudy day, never in the morning when the full day’s heat is still ahead. Water deeply right after planting, and mulch heavily to keep soil temperatures down. A three-to-four-inch layer of pine straw or wood chips makes a measurable difference in root-zone temperature and moisture retention.
Florida’s afternoon thunderstorms in August can dump several inches of rain in under an hour. That is great for established plants but can flatten seedlings, wash away seeds, and waterlog poorly drained beds. Raised beds are a significant advantage here because they shed excess water. If you are growing in flat ground beds, make sure drainage channels are clear before planting. For newly sown seeds, a light covering of straw or row cover fabric helps prevent washout without blocking germination.
Insect pressure in August is intense. Whiteflies, aphids, and leaf-footed bugs are at peak numbers, and caterpillars like the tomato hornworm and armyworm are feeding aggressively before the fall cooldown. Bt (Bacillus thuringiensis) sprays handle most caterpillar problems without harming beneficial insects. For whiteflies and aphids, a strong water spray to knock them off plants combined with encouraging natural predators like ladybugs and lacewings is more sustainable than chemical sprays, which tend to kill the beneficial insects keeping the population in check. Neem oil is a reasonable middle ground for heavy infestations, though it needs to be applied in the evening to avoid burning foliage in the August sun.
What Not to Plant in August
Knowing what to avoid saves time and money. Lettuce, spinach, and most salad greens will bolt, wilt, or simply fail to germinate in August’s heat across all of Florida. Even in air-conditioned seed-starting setups, lettuce seedlings planted out in August rarely survive. Wait until October or November for leafy greens.
Strawberries are a common question, but they should not go in the ground until October at the earliest, and bare-root plants from nurseries are not typically available until then anyway. Carrots, beets, and turnips also need cooler soil to germinate properly and perform much better as a late-fall or winter planting.
Cool-season brassicas like broccoli, kale, and Brussels sprouts should be started as seeds indoors in August, as discussed earlier, but transplanting them into outdoor beds this month is a mistake. The heat will stress them into bolting or cause them to develop weak, leggy growth that never recovers. The exception is collard greens, which tolerate heat better than other brassicas and can sometimes be transplanted outdoors in late August in North Florida if given afternoon shade.
Potatoes are another crop to skip. Florida’s potato season runs from January through March in most of the state, and the seed potatoes you would need are not available in August anyway. Trying to force an off-season potato crop in Florida’s summer soil invites every fungal disease in the book.
Tropical Fruit Trees and Perennials
August’s heavy rains actually make it a decent time to plant tropical fruit trees in Central and South Florida, as long as you choose the right species. Mango, avocado, papaya, and lychee trees established during the rainy season benefit from the consistent moisture, which helps root systems expand before the drier winter months. The caveat is that newly planted trees need staking and protection from the wind gusts that accompany August thunderstorms. A young mango tree snapped at the graft union by a summer storm is an expensive lesson.
Banana plants, which are technically giant herbs rather than trees, grow explosively in August’s heat and moisture. If you have the space, planting banana pups in August gives them a full growing season before the following summer’s fruiting cycle. Moringa, another heat-loving perennial, can be planted from seed or cuttings in August and will grow several feet before the end of the year.
For North Florida, August tree planting is riskier because new trees need time to harden off before winter. Cold-hardy citrus like satsuma mandarins and kumquats can be planted in August, but tender tropical species should wait until spring. A satsuma planted in August and well-mulched through its first winter will establish much faster than one planted in October with less root development time before cold weather arrives.