Acorn Squash in Zone 8A — Southeast

Acorn squash is a rewarding addition to any Southeastern garden. Its sweet, nutty flavor shines in everything from roasted side dishes to hearty soups, and it stores well, offering a taste of summer throughout the cooler months. Plus, the satisfaction of harvesting your own squash after our long summer is hard to beat.

While our hot and humid summers in the Southeast can present challenges, the long 245-day growing season gives you plenty of time to successfully cultivate acorn squash. Careful timing and attention to common issues will ensure a bountiful harvest.

Starting acorn squash indoors isn't typically necessary in the Southeast, given our long growing season, but it can give you a head start if you're eager to harvest as early as possible. Start seeds indoors early to late March, about three weeks before you intend to transplant them outside. Use seed trays filled with a good seed-starting mix, and keep them in a warm spot with plenty of light – a sunny windowsill or under grow lights works well.

Be sure to keep the soil consistently moist, bottom watering is a great way to do this without disturbing the new seedlings. Our moderate spring weather generally makes direct sowing the easier option, but starting indoors can be helpful if you have limited garden space or want to get a jump on the season.

Transplant your acorn squash seedlings outdoors from late March through late April, once the danger of frost has passed. Before transplanting, harden off your seedlings by gradually exposing them to outdoor conditions for about a week. This helps them adjust to the sun and wind, preventing 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 cold snap can still occur, so be prepared to cover your young plants if necessary.

Direct sowing is the preferred method for growing acorn squash in the Southeast. Sow seeds late March through early August, ensuring the soil temperature is at least 60°F. Prepare your garden bed by amending our often-heavy clay soil with compost to improve drainage and fertility.

Plant seeds about an inch deep, spacing them 36-48 inches apart. Water well after planting and keep the soil consistently moist until seedlings emerge. Direct sowing takes advantage of our reliable summer rains and avoids the potential stress of transplanting.

Acorn squash needs consistent moisture, especially during its active growth phase. In the Southeast's hot and humid climate, aim for about 1 inch of water per week, either from rainfall or irrigation. Use the "finger test" – if the top 2 inches of soil feel dry, it's time to water.

During the peak of our summer heat, you might need to water more frequently. As the fruits mature, you can slightly reduce the amount of water you provide. Focus on watering at the base of the plant to avoid wetting the foliage, which can increase the risk of fungal diseases in our humid environment.

Signs of underwatering include wilting leaves and stunted growth. Overwatering, on the other hand, can lead to root rot and yellowing leaves. A layer of mulch, such as pine straw or shredded leaves, can help retain moisture in the soil and suppress weeds, which is particularly useful in our region.

You can expect your first acorn squash harvest from mid June through mid November in the Southeast, about 85 days after planting. The squash is ripe when the skin is a deep, dark green and has a hard shell. Look for an orange spot where the squash has been resting on the ground – this is a good indicator of ripeness.

The stem should be dry and firm. Use a sharp knife to cut the squash from the vine, leaving a few inches of stem attached. This helps prevent rot during storage.

As our first frost approaches in mid- November, harvest any remaining squash, even if they are not fully ripe. While they won't ripen off the vine, you can still use them in cooking, although they may not be as sweet.

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

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 (excrement) nearby. *What causes it:* Larvae of a moth that bore into the stems and feed on the plant tissue. The Southeast's long growing season allows for multiple generations. *How to fix/prevent it:* Wrap stems with foil or fabric. Inject Bacillus thuringiensis (Bt) into the stem near the entry point. Remove and destroy infested vines after harvest.

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). *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: The hot, humid summers and frequent afternoon thunderstorms in the Southeast create ideal conditions for fungal diseases like powdery mildew. Regular monitoring, good air circulation, and preventative treatments are essential. Japanese beetles can also be a nuisance, so be prepared to hand-pick them or use appropriate insecticides if necessary.

Acorn squash benefits from companion planting. Corn provides a natural trellis for the squash vines to climb, saving space in your garden. Green beans fix nitrogen in the soil, which helps the squash grow. Radishes deter squash vine borers and other pests. Marigolds repel nematodes and other harmful insects.

Avoid planting acorn squash near potatoes, as they compete for the same nutrients in the soil. Brassicas like cabbage and broccoli can also inhibit the growth of squash, so keep them separated in your garden.