Florida’s warm climate allows watermelon planting from February through April, avoiding rainy season. Knowing exactly When To Plant Watermelon In Florida is key to getting sweet, juicy fruit before summer storms arrive. This guide gives you the timing, soil tips, and care steps for a successful harvest.
Watermelons love heat and sunshine. Florida’s long growing season is perfect, but you must plant at the right time. Plant too early and cold soil can kill seeds. Plant too late and heavy rains may rot your melons.
When To Plant Watermelon In Florida
The ideal planting window depends on your region. Florida has three main climate zones: North, Central, and South. Each zone has slightly different dates.
North Florida Planting Dates
North Florida includes areas like Jacksonville, Tallahassee, and Gainesville. Here, winters are cooler and frost is possible until mid-March.
- Start seeds indoors: Late February to early March
- Transplant outdoors: Mid-March to early April
- Direct sow seeds: Late March to mid-April
Soil temperature must be at least 70°F. Use a soil thermometer to check. Cold soil stops germination and stunts growth.
Central Florida Planting Dates
Central Florida covers Orlando, Tampa, and Daytona Beach. Frost is rare after February, so you can plant earlier.
- Direct sow seeds: Mid-February to late March
- Transplant seedlings: Early March to mid-April
Central Florida’s spring is warm but not too humid. This is the sweet spot for watermelon growth.
South Florida Planting Dates
South Florida includes Miami, Fort Lauderdale, and Naples. Frost almost never happens here. You have two planting windows.
- Spring planting: January to March
- Fall planting: August to September
Fall planting avoids the rainy season but needs careful watering. Spring planting gives you fruit by late May or June.
Best Watermelon Varieties For Florida
Not all watermelons grow well in Florida’s humidity. Choose varieties that resist diseases like fusarium wilt and powdery mildew.
Recommended Types
- Crimson Sweet: Classic striped melon, very sweet, good disease resistance
- Jubilee: Large, oblong melon, thrives in heat
- Sugar Baby: Small, round, perfect for small gardens
- Charleston Gray: Tough rind, handles humidity well
- Mini Love: Personal-sized melon, matures fast
These varieties are tested in Florida’s climate. They produce fruit even with some rain and heat stress.
Preparing Your Soil For Watermelons
Watermelons need loose, well-draining soil. Florida’s sandy soil is actually good, but it lacks nutrients. You must amend it.
Soil Testing First
Test your soil pH. Watermelons prefer a pH between 6.0 and 6.8. Florida soil is often acidic, around 5.5. Add lime to raise pH if needed.
You can buy a simple test kit at any garden center. Test in fall so you have time to adjust before spring planting.
Adding Organic Matter
Mix in 2 to 3 inches of compost or well-rotted manure. This improves water retention in sandy soil. It also adds nutrients.
Work the compost into the top 6 to 8 inches of soil. Do this a few weeks before planting.
Using Fertilizer
Watermelons are heavy feeders. Use a balanced fertilizer like 10-10-10 before planting. Apply about 1 pound per 100 square feet.
Side-dress with nitrogen fertilizer when vines start to run. Use a 21-0-0 fertilizer at 1/2 pound per 100 feet of row.
How To Plant Watermelon Seeds Or Seedlings
You can start from seed or buy transplants. Seeds are cheaper but take longer. Transplants give you a head start.
Direct Seeding Steps
- Wait until soil temperature is at least 70°F
- Plant seeds 1 inch deep
- Space seeds 2 to 3 feet apart in rows 6 feet apart
- Plant 2 to 3 seeds per hole, then thin to the strongest plant
- Water gently after planting
Seeds germinate in 4 to 12 days depending on soil warmth. Keep soil moist but not soggy.
Transplanting Seedlings
- Harden off seedlings for 5 to 7 days before planting
- Dig holes slightly larger than the root ball
- Space plants 2 to 3 feet apart
- Plant at the same depth as the pot
- Water well after transplanting
Transplants are more expensive but give you a 2 to 3 week head start. This can be helpful in North Florida.
Watering And Care During Growth
Watermelons need consistent moisture, especially during flowering and fruit set. But Florida’s rain can be unpredictable.
Watering Schedule
- Water deeply 1 to 2 times per week
- Give plants 1 to 2 inches of water per week
- Use drip irrigation to keep leaves dry
- Reduce watering when fruit ripens to boost sweetness
Wet leaves promote fungal diseases. Water at the base of plants in the morning.
Mulching Benefits
Apply a 2 to 3 inch layer of organic mulch around plants. Straw, pine straw, or shredded leaves work well. Mulch keeps soil cool, retains moisture, and suppresses weeds.
Black plastic mulch is also popular in Florida. It warms the soil faster in spring and reduces weed growth.
Pollination Help
Watermelons need bees for pollination. Plant flowers like marigolds or zinnias nearby to attract pollinators. Avoid using pesticides during flowering.
If bees are scarce, hand-pollinate. Use a small brush to transfer pollen from male flowers to female flowers. Female flowers have a small swelling at the base.
Common Pests And Diseases In Florida
Florida’s warm, humid climate is perfect for pests and diseases. Watch for these problems.
Major Pests
- Aphids: Small insects that suck sap. Spray with insecticidal soap.
- Cucumber beetles: Yellow and black striped beetles. Use row covers early.
- Spider mites: Tiny pests that cause stippled leaves. Hose plants off with water.
- Squash bugs: Brown bugs that suck plant juices. Hand pick and destroy eggs.
Check plants weekly. Early detection makes control easier.
Common Diseases
- Powdery mildew: White powder on leaves. Use resistant varieties and good air flow.
- Fusarium wilt: Yellowing and wilting. Rotate crops every 3 years.
- Anthracnose: Dark spots on leaves and fruit. Avoid overhead watering.
- Downy mildew: Yellow patches on leaves. Apply fungicide preventively.
Disease pressure is highest during rainy season. Plant early to avoid peak disease periods.
Harvesting Your Watermelons
Knowing when to pick is tricky. Watermelons don’t ripen after harvest. You must pick at the right time.
Signs Of Ripeness
- The tendril nearest the fruit turns brown and dry
- The bottom spot (where it touches the ground) turns from white to creamy yellow
- The rind loses its shine and becomes dull
- The fruit sounds hollow when tapped (but this is not always reliable)
Most varieties take 70 to 90 days from planting to harvest. Check your seed packet for exact days.
How To Harvest
Use a sharp knife or pruners to cut the stem. Leave a 2 to 3 inch stem attached to the fruit. This helps the melon last longer in storage.
Handle melons gently. Bruising can cause rot. Store harvested melons in a cool, shady spot.
Extending The Season With Succession Planting
You can plant watermelons in waves for a longer harvest. This works well in Central and South Florida.
Succession Planting Schedule
- First planting: Late February to early March
- Second planting: Late March to early April
- Third planting (South Florida only): Late August
Space plantings 3 to 4 weeks apart. This gives you fresh melons from June through September.
In North Florida, stick to one or two plantings. The rainy season and cooler fall limit later crops.
Container Growing For Small Spaces
You can grow watermelons in containers if you lack garden space. Choose compact varieties like Sugar Baby or Mini Love.
Container Requirements
- Use a pot at least 5 gallons in size
- Ensure drainage holes are present
- Fill with quality potting mix mixed with compost
- Place in full sun (at least 8 hours daily)
Container plants dry out faster. Water daily in hot weather. Fertilize every 2 weeks with a liquid fertilizer.
You may need to support fruit with a sling made from pantyhose or fabric. This prevents stems from breaking.
Dealing With Florida’s Rainy Season
Florida’s rainy season typically starts in June and lasts through September. Heavy rain can cause problems for watermelons.
Rain Protection Tips
- Plant on raised beds or mounds for better drainage
- Use row covers or low tunnels to shield plants from heavy rain
- Apply fungicides preventively before rain events
- Pick fruit promptly when ripe to avoid rot
If you plant in February or March, you harvest before the heaviest rains arrive. This is the main reason for early planting.
Fertilizing Throughout The Season
Watermelons need regular feeding. Florida’s sandy soil leaches nutrients quickly. You must replenish them.
Fertilizer Schedule
- At planting: Apply 10-10-10 fertilizer
- When vines start running: Apply 21-0-0 (ammonium sulfate) at 1/2 pound per 100 feet
- When fruit sets: Apply 0-0-60 (potash) at 1/4 pound per 100 feet
Water after applying fertilizer to move nutrients into the root zone. Avoid getting fertilizer on leaves.
Organic options include fish emulsion, seaweed extract, and compost tea. Apply every 2 to 3 weeks.
Companion Plants For Watermelons
Certain plants help watermelons grow better. They repel pests or improve soil.
Good Companions
- Marigolds: Repel nematodes and aphids
- Nasturtiums: Attract aphids away from melons
- Corn: Provides shade and wind protection
- Beans: Fix nitrogen in the soil
- Radishes: Deter cucumber beetles
Bad Companions
- Potatoes: Compete for nutrients and attract similar pests
- Cucumbers: Share diseases with watermelons
- Squash: Also shares pests and diseases
Rotate crops each year. Do not plant watermelons where cucumbers, squash, or melons grew the previous year.
Storing And Using Your Watermelons
Fresh watermelons taste best. But you can store them for a short time.
Storage Tips
- Whole watermelons keep at room temperature for 7 to 10 days
- Refrigerate cut melon in an airtight container for up to 3 days
- Do not wash the rind until ready to cut
- Keep melons away from ethylene-producing fruits like apples and bananas
You can freeze watermelon chunks for smoothies. Remove seeds and freeze on a tray before bagging.
Troubleshooting Common Problems
Even with good care, problems arise. Here are solutions to common issues.
Poor Fruit Set
If flowers drop without forming fruit, lack of pollination is likely. Attract more bees or hand-pollinate. Hot weather above 95°F can also cause flower drop.
Blossom End Rot
Dark, sunken spots on the blossom end of fruit indicate calcium deficiency. Keep soil evenly moist and avoid over-fertilizing with nitrogen. Add calcium with gypsum or lime.
Cracking Fruit
Irregular watering causes fruit to crack. Water consistently, especially during fruit development. Mulch helps maintain even soil moisture.
Yellow Leaves
Yellow leaves can mean overwatering, nutrient deficiency, or disease. Check soil moisture first. If soil is wet, let it dry. If dry, fertilize. Remove diseased leaves promptly.
Frequently Asked Questions
Can I plant watermelon in Florida in May?
May is risky because rainy season starts soon. In South Florida, you might succeed with fast-maturing varieties. In North and Central Florida, stick to February through April.
How late can I plant watermelon in Florida?
For spring planting, late April is the cutoff in most areas. Fall planting in South Florida can go into September. After that, days get shorter and cooler.
Do watermelons need full sun in Florida?
Yes, at least 8 hours of direct sunlight daily. Florida’s sun is intense, but watermelons thrive in it. Some afternoon shade in extreme heat can help, but full sun is best.
What is the best month to plant watermelon in Florida?
March is the best month for most of Florida. Soil is warm enough, and you avoid the worst of rainy season. South Florida can plant in February.
How deep should I plant watermelon seeds in Florida soil?
Plant seeds 1 inch deep. In sandy soil, you can go slightly deeper, up to 1.5 inches. Cover lightly and water gently.
Growing watermelons in Florida is rewarding when you time it right. Start with good soil, choose the right variety, and plant in the correct window. You will enjoy sweet, homegrown melons all summer long. Remember to water consistently, watch for pests, and harvest at peak ripeness. With a little effort, your Florida garden can produce bumper crops of delicious watermelons.