Acorn Squash in Zone 7B — Southeast

Acorn squash is a rewarding addition to any Southeast garden. The sweet, nutty flavor is perfect roasted, stuffed, or in soups as the temperatures (eventually) cool down. Plus, seeing those vibrant green fruits mature on the vine is incredibly satisfying.

Our long growing season here in Zone 7B gives you plenty of time to get a harvest, even with our hot and humid summers. While disease pressure can be a concern, careful timing and good gardening practices will set you up for success with this 235-day growing season.

Starting acorn squash indoors isn't strictly necessary in our Southeast climate, but it can give you a jump start, especially if you're eager for an early harvest. You can start seeds indoors from early to late March, about three weeks before you plan to transplant them outside.

Use seed trays with a good seed-starting mix and provide consistent warmth and light. Bottom watering helps prevent damping-off, a common problem with seedlings. Our moderate spring weather means indoor-started squash will be ready to go out as soon as the soil warms up.

Transplant your acorn squash seedlings outdoors from early April through early May. Before planting, harden them off by gradually exposing them to outdoor conditions for about a week. This prevents transplant shock.

Space your plants 36-48 inches apart to allow for their vining growth habit. Keep an eye on the weather forecast; a late frost can still happen, so be prepared to cover your seedlings if necessary.

Direct sowing is the preferred method for planting acorn squash in the Southeast. You can direct sow from late March through early August, giving you a wide window to get your seeds in the ground.

Choose a sunny spot with well-draining soil. Amend our typical clay soil with compost to improve drainage and fertility. Sow seeds 1 inch deep, spacing them 36-48 inches apart. Warmer soil temperatures are key for germination.

Acorn squash needs consistent moisture, especially during its active growing period, but with our humid Southeast summers, overwatering can be a real problem. Aim for about 1 inch of water per week, either from rainfall or irrigation.

Use the "finger test" – stick your finger about 2 inches into the soil. If it feels dry, it's time to water. Water at the base of the plant to avoid wetting the foliage, which can encourage fungal diseases in our humid climate.

As the fruits mature, you can slightly reduce watering to help them ripen. Signs of underwatering include wilting leaves, while yellowing leaves and mushy stems can indicate overwatering. Mulching around the plants helps retain moisture and suppress weeds.

You can expect your first acorn squash harvest from mid June through early November, depending on when you planted. Acorn squash is ready to harvest about 85 days after planting.

Look for a dark green skin with an orange spot where the squash touched the ground. The shell should be hard, and the stem should be dry. Use a sharp knife to cut the squash from the vine, leaving a few inches of stem attached. This helps with storage.

As our first frost approaches in early November, harvest any remaining squash, even if they aren't fully mature. Smaller, less mature squash can still be used in soups and stews.

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

Squash Vine Borer

• What it looks like: Wilting vines, especially during the heat of the day. Small holes near the base of the stem with sawdust-like frass.
• What causes it: Moth larvae that bore into the stems and feed on the plant's tissues. The moths are active in the spring and summer.
• How to fix/prevent it: Wrap stems with aluminum foil or netting to prevent moths from laying eggs. Inject Bacillus thuringiensis (Bt) into the stem to kill larvae. Remove infested stems.

Powdery Mildew

• What it looks like: White or grayish powdery coating on leaves, stems, and sometimes fruit. Leaves curl, yellow, and die.
• What causes it: Various fungi that thrive in warm days, cool nights, and moderate humidity. Dry leaf surfaces actually favor it (unlike most fungi). Our humid summers create ideal conditions.
• 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.

Southeast Specific Challenges: Our hot, humid summers and wet-summer rainfall create a perfect storm for fungal diseases like powdery mildew. Japanese beetles can also be a nuisance, skeletonizing the leaves. Regular monitoring and proactive treatment are key to keeping your acorn squash healthy and productive in our Southeast climate.

Acorn squash benefits from companion planting. Corn provides a natural trellis for the squash vines to climb. Green beans fix nitrogen in the soil, benefiting the squash. Radishes deter squash vine borers, and marigolds repel nematodes and other pests.

Avoid planting acorn squash near potatoes, as they compete for nutrients. Brassicas like cabbage and broccoli can attract similar pests, increasing the risk of infestation.