Acorn Squash in Zone 10A — Florida

Acorn squash is a rewarding addition to your Florida garden. Its sweet, nutty flavor shines in everything from simple roasted dishes to more elaborate fall-inspired meals. Plus, you’ll feel a real sense of accomplishment harvesting your own winter squash when most folks are just surviving the heat.

Our Florida gardening calendar is different, and summer is definitely the slow season. But by planting at the right time, you can easily grow acorn squash during our extended warm season. With our 355-day growing season, you can beat the heat and humidity, and enjoy a delicious fall and winter harvest.

Starting acorn squash indoors isn't usually necessary in our Zone 10A climate, given our long growing season. However, if you want a jump start, particularly for an earlier harvest, you can start seeds indoors from late December through mid January, about three weeks before you'd transplant them outside. Use seed trays with a good seed-starting mix, provide warmth (a heat mat helps), and ensure they get plenty of light. Bottom watering helps prevent damping off, a common problem with seedlings, especially with our high humidity. Remember, our spring is reversed, so you're starting these when the rest of the country is planning their spring gardens!

Transplant your acorn squash seedlings outdoors from late January through late February. Before transplanting, harden them off for about a week by gradually exposing them to outdoor conditions. This helps them adjust to the sun and wind. Space the plants 36-48 inches apart to give them plenty of room to sprawl. Be mindful of any late-season cold snaps; while we're generally frost-free, those unexpected cool periods can still stress young plants.

Direct sowing is the recommended method for growing acorn squash in Florida. Sow seeds mid January through late September. Choose a sunny spot with well-draining soil. Amend the soil with compost to improve its fertility and drainage, especially if you're dealing with our sandy soil. Plant seeds 1 inch deep and space them 36-48 inches apart. Keep the soil consistently moist until the seeds germinate. Even though winter squash needs a long growing season, direct sowing works great here because our "winter" is so mild.

Acorn squash needs consistent watering, especially during its active growth period. Aim to water deeply whenever the top 2 inches of soil feel dry to the touch – use the finger test. During the hotter, drier periods of the spring and fall, this might mean watering 1-2 inches per week. Our wet-summer rainfall can take care of the watering for you during those months, but make sure the plants aren't sitting in standing water.

Water at the base of the plant to avoid wetting the foliage, which can encourage fungal diseases in our humid climate. Signs of underwatering include wilting leaves and stunted growth. Overwatering, on the other hand, can lead to root rot, so ensure your soil drains well.

A good layer of mulch around the base of the plants helps retain moisture in the soil and suppress weeds. Pine straw or wood chips work well in our Florida gardens.

You can expect your first acorn squash harvest from mid April through late December, about 85 days after planting. The squash is ready to harvest when the skin is a dark green color and has a hard shell. Look for an orange spot where the squash touches the ground – this is a good sign of ripeness. The stem should also be dry and hard.

To harvest, use a sharp knife or pruning shears to cut the squash from the vine, leaving about 2-3 inches of stem attached. This helps to prevent rot. Acorn squash doesn't ripen off the vine, so make sure it's fully mature before harvesting.

As our short days approach in late December, harvest any remaining squash before any unexpected frost. Even a light frost can damage the fruit.

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 stem and sawdust-like frass.
• What causes it: The larvae of a moth that bores into the stems of squash plants, disrupting water and nutrient flow.
• How to fix/prevent it: Wrap stems with foil or row cover early in the season to prevent moths from laying eggs. Inject Bacillus thuringiensis (Bt) into the stem to kill the borers. Remove and destroy infested vines.

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: The combination of high heat and very-high humidity in our wet-summer climate creates the perfect breeding ground for fungal diseases. Also, our sandy soil can be challenging, as it doesn't retain water or nutrients well. Regular soil amendments with compost and consistent monitoring for pests and diseases are key to success.

Acorn squash benefits from companion planting. Corn acts as a natural trellis for the squash vines, and beans-green fix nitrogen in the soil, which helps the squash grow. Radishes deter squash vine borers and cucumber beetles, while marigolds repel nematodes, a common problem in Florida's sandy soils.

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