Acorn Squash in Zone 8B — Florida

Acorn squash is a fantastic addition to your fall and winter meals here in Florida. Its sweet, nutty flavor makes it incredibly versatile in the kitchen, and there's a real satisfaction in harvesting your own winter squash as the weather (finally!) cools down a bit. Plus, it's a great way to extend your gardening season.

We know, Florida gardening can be tricky with our summer heat, humidity, and sandy soil. But don't worry! With a little planning and the right timing, you can absolutely grow acorn squash successfully. Our long growing season of around 303 days gives you plenty of opportunity to get a harvest.

Starting acorn squash indoors isn't as common here, but it can be useful if you want a head start. Begin in early to late February, about three weeks before you plan to transplant. Use seed trays with a good seed-starting mix, keep them warm (a heat mat helps), and provide plenty of light with grow lights.

Remember to water from the bottom to avoid damping-off, a common problem in our humid climate. Fill a tray with water and let the seed trays soak it up. Our reversed spring season means you're fighting against warming temperatures, so indoor starting is more about getting a jump than escaping cold.

Transplant your acorn squash seedlings outdoors in early to late March, once they have a few true leaves. Before transplanting, harden them off by gradually exposing them to outdoor conditions for about a week. This helps them adjust to the sun and wind.

Space the plants 36-48 inches apart. Keep an eye on the weather forecast. We sometimes get unexpected cold snaps this time of year, so be ready to cover your seedlings if necessary.

Direct sowing is the easiest and most reliable method for growing acorn squash in Florida. Sow seeds directly into the garden from late February through early September. The key is to wait until the soil has warmed up a bit.

Prepare the soil by amending it with plenty of compost. Acorn squash needs well-draining soil, and our sandy soil benefits from the added organic matter. Plant seeds about an inch deep, spacing them 36-48 inches apart. Keep the soil consistently moist until the seedlings emerge.

Watering is crucial for acorn squash, especially in our hot and humid Florida climate. While acorn squash isn't drought tolerant, overwatering can lead to fungal problems. Finding the right balance is key.

During the active growing season (spring and fall), water deeply about once or twice a week, providing about 1-2 inches of water. Use the finger test to check soil moisture – if the top 2 inches are dry, it's time to water. During our wet summer months, you may not need to water as often, relying on rainfall to do the job.

Water at the base of the plant to avoid wetting the leaves, which can encourage fungal diseases in our humid climate. Signs of underwatering include wilting leaves, while yellowing leaves can indicate overwatering. Mulching around the plants helps retain moisture in the soil and suppress weeds.

You can expect your first harvest of acorn squash from mid-May through mid-December, about 85 days after planting. Keep an eye on your plants as the days get shorter.

Ripe acorn squash will have a dark green skin with a noticeable orange spot where it rested on the ground. The shell should be hard, and the stem should be dry and tough. To harvest, use a sharp knife to cut the squash from the vine, leaving a few inches of stem attached.

As our first frost approaches in mid- December, harvest any remaining squash, even if they are not fully ripe. Smaller, less mature squash can still be used in soups or stews.

Acorn squash can face a few challenges in Florida. Here's how to tackle them:

• Squash Vine Borer
• What it looks like: Wilting vines, holes in the stem near the base, and sawdust-like frass (borer poop) near the holes.
• What causes it: Moth larvae that bore into the stems, feeding on the plant tissue. They thrive in warmer weather.
• How to fix/prevent it: Wrap stems with foil to prevent egg-laying. Inject Bacillus thuringiensis (Bt) into the stem to kill the borers. Monitor plants regularly and remove any infested stems promptly.
• Powdery Mildew
• What it looks like: White or grayish powdery coating on leaves, stems, and sometimes fruit. Leaves curl, yellow, and die. Reduces plant vigor.
• What causes it: Various fungi that thrive in warm days, cool nights, and moderate humidity. Dry leaf surfaces actually favor it (unlike most fungi).
• How to fix/prevent it: Improve air circulation through spacing and pruning. Remove affected leaves. Neem oil or potassium bicarbonate sprays help. Milk spray (1 part milk to 9 parts water) is surprisingly effective. Plant resistant varieties.
• Squash Bugs
• What it looks like: Gray-brown shield-shaped bugs on leaf undersides. Bronze egg clusters on leaves. Wilting leaves that turn brown and crispy.
• What causes it: Sap-sucking insects that inject toxin while feeding. Adults overwinter in garden debris and emerge in spring.
• How to fix/prevent it: Hand-pick adults and crush egg clusters. Board traps (adults hide under boards at night — flip and destroy in morning). Neem oil spray. Remove plant debris in fall. Companion plant with nasturtiums.
• Cucumber Beetles
• What it looks like: Small yellow-green beetles with black spots or stripes on leaves and flowers. Leaves have small holes. Plants may wilt suddenly from bacterial wilt transmitted by beetles.
• What causes it: Adult beetles feed on leaves and flowers and transmit bacterial wilt disease. Larvae feed on roots.
• How to fix/prevent it: Row covers until flowering (remove for pollination). Hand-pick adults. Yellow sticky traps. Neem oil or pyrethrin spray. Kaolin clay coating. Interplant with radishes or nasturtiums as trap crops.

Florida Specific Challenges: Our hot, humid summers and high rainfall create a perfect environment for fungal diseases like powdery mildew. Good air circulation and preventative treatments are essential. Nematodes can also be a problem in our sandy soil, so consider using nematode-resistant varieties or soil solarization before planting.

Companion planting can help your acorn squash thrive. Corn provides support for the vines and creates a beneficial microclimate. Green beans fix nitrogen in the soil, which benefits the squash. Radishes deter pests and break up the soil. Marigolds repel nematodes and other harmful insects.

Avoid planting acorn squash near potatoes or brassicas (like cabbage and broccoli). Potatoes compete for the same nutrients, and brassicas can attract pests that also affect squash.