Acorn Squash in Zone 9A — Florida

Acorn squash is a rewarding crop for Florida gardeners because of its sweet, nutty flavor and versatility in the kitchen. Imagine roasting it with cinnamon, stuffing it with wild rice, or pureeing it into a creamy soup – all from your own backyard! Plus, growing your own food is always satisfying.

Our Florida gardening calendar is different, and summer is the slow season, but don't let that discourage you. With our long growing season (around 327 days!), you can successfully grow acorn squash if you time things right. We'll work *with* the weather, planting at the optimal time to avoid the worst of the heat and humidity.

Starting acorn squash indoors isn't usually necessary here in Florida, as direct sowing works well and avoids transplant shock. However, if you're eager to get a head start, or if you want to ensure you get a crop in before any late-season hurricanes, you can start seeds indoors from mid January through early February, about three weeks before you'd transplant them outside.

Use seed trays or small pots filled with a good seed-starting mix. Keep them warm (a heat mat helps) and provide plenty of light, either from a sunny window or a grow light. Bottom watering is ideal to prevent damping off – just set the tray in a shallow dish of water and let the soil absorb it from the bottom. Remember our reversed spring – you're starting these indoors during our coolest months!

If you started your acorn squash indoors, transplant them outdoors from mid February through mid March. Before transplanting, harden off the seedlings 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 to give them plenty of room to grow. Be mindful of late cold snaps that can still occur during this time in Florida. If a freeze is predicted, cover your seedlings with blankets or row covers.

Direct sowing is the preferred method for growing acorn squash in Florida. Sow seeds directly into the garden from early February through mid September. This wide window makes it easy to fit into our unique growing season.

Prepare the soil by amending it with compost or other organic matter. Acorn squash needs soil temperatures of at least 60°F for germination. Plant seeds about 1 inch deep, spacing them 36-48 inches apart. Keep the soil consistently moist until the seedlings emerge. Even though winter squash needs a long season, direct sowing still works great in our climate.

Acorn squash needs moderate watering, especially during its active growth phase. Aim to keep the soil consistently moist, but not waterlogged. Our hot summers and high humidity mean you need to be extra vigilant about watering properly.

During the warmer months, especially from late spring through summer, you'll likely need to water your acorn squash deeply two to three times a week, providing about 1-2 inches of water each time. Use the "finger test" – stick your finger into the soil about 2 inches deep. If it feels dry, it's time to water. As the fruits mature, you can reduce the watering slightly. 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 and slow growth. Overwatering can lead to root rot and yellowing leaves. Mulching around the plants with pine straw or wood chips will help retain moisture and suppress weeds.

In Florida, you can expect your first acorn squash harvest from early May through late December, about 85 days after planting. Keep an eye on your plants and watch for the signs of ripeness.

The skin should be a dark green color with an orange spot where the squash has been resting on the ground. The shell should be hard and difficult to pierce with your fingernail, and the stem should be dry and starting to crack. To harvest, use a sharp knife or pruners to cut the squash from the vine, leaving a few inches of stem attached. Acorn squash will not ripen off the vine.

As our first frost approaches in late December, harvest any remaining squash, even if they're not fully mature. Smaller, less mature squash can still be used in cooking, or you can try to ripen them indoors in a warm, dry place.

Here are some common problems you might encounter growing acorn squash in Florida:

Squash Vine Borer

• What it looks like: Wilting vines that suddenly collapse, often with small holes near the base of the plant and sawdust-like frass.
• What causes it: Squash vine borer moths lay eggs near the base of the plant, and the larvae burrow into the stem, feeding on the plant's tissues. They love squash in the early summer.
• How to fix/prevent it: Wrap the base of the stems with foil or netting to prevent the moths from laying eggs. You can also inject Bacillus thuringiensis (Bt) into the stems to kill the larvae.

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 are a breeding ground for fungal diseases like powdery mildew. Nematodes in the sandy soil can also be a problem, so consider planting in raised beds or containers with nematode-free soil. Choose nematode-resistant varieties whenever possible.

Good companion plants for acorn squash include corn and beans. Corn provides a natural trellis for the squash vines, while beans fix nitrogen in the soil, benefiting the squash. Radishes help deter squash bugs and cucumber beetles. Marigolds repel nematodes and other pests.

Avoid planting acorn squash near potatoes or brassicas (like cabbage and broccoli). Potatoes compete for nutrients, and brassicas can attract pests that also attack squash. By choosing the right companion plants, you can create a thriving and healthy garden ecosystem.