Acorn Squash in Zone 8B — Southeast

Acorn squash is a rewarding addition to any Southeastern garden. Its nutty, slightly sweet flavor makes it incredibly versatile in the kitchen, perfect for everything from roasting and stuffing to adding to soups and stews. Plus, there's a real satisfaction in harvesting your own winter squash after our long summer growing season.

Our hot and humid summers can present some challenges, but with careful timing and attention, you can absolutely grow beautiful acorn squash. With our long growing season of around 255 days, you've got plenty of time to get a crop in, even with the occasional afternoon thunderstorms.

Starting acorn squash indoors is possible, but usually not necessary in our climate. Considering our moderate spring and long growing season, direct sowing is generally the preferred method. However, if you're eager to get a head start or want to ensure a good crop in a shorter season variety, starting indoors can be helpful.

If you choose to start seeds indoors, do so from late February through mid March, giving you about 3 weeks before transplanting. Use seed trays filled with a good seed-starting mix, and keep them in a warm place with plenty of light – a sunny window or under grow lights works well. Remember to water from the bottom to encourage strong root growth and avoid damping off.

Transplanting acorn squash outdoors should occur from late March through late April, after the last expected frost. 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.

When transplanting, space the seedlings 36-48 inches apart to give them plenty of room to spread. Keep an eye on the weather forecast, as late frosts can still occur in the Southeast during this time. If frost is predicted, cover your seedlings with blankets or row covers to protect them.

Direct sowing is the recommended method for growing acorn squash in the Southeast. Our long growing season makes it easy to get a successful harvest this way. You have a wide window for direct sowing, from mid March through mid August.

Choose a sunny spot with well-drained soil. Acorn squash needs soil temperatures of at least 60°F to germinate, so wait until the soil has warmed up. Prepare the soil by amending it with compost or other organic matter to improve drainage and fertility. Sow seeds 1 inch deep and 36-48 inches apart.

Acorn squash needs consistent watering, especially during the hot and humid summer months in the Southeast. While we get our share of rainfall, it's important to supplement when needed to keep your plants healthy. Aim for moderate watering throughout the growing season, reducing it slightly as the fruit matures.

A good way to check if your plants need water is the "finger test." Stick your finger into the soil about 2 inches deep. If it feels dry, it's time to water. Generally, aim for about 1-2 inches of water per week, depending on rainfall. Given our humid climate, it's best to water at the base of the plants to avoid getting the leaves wet, which can encourage fungal diseases.

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 around your plants can help retain moisture and suppress weeds, which is especially helpful in our hot summers. Pine straw or shredded leaves work great.

You can expect your first acorn squash harvest from early June through mid November in the Southeast, about 85 days after planting. Keep an eye on your plants, and be sure to harvest at the right time for best flavor and storage. The best indicators of ripeness are a dark green skin with an orange spot where the squash touches the ground, a hard shell, and a dry, hardened stem.

To harvest, use a sharp knife or pruners to cut the squash from the vine, leaving a few inches of stem attached. Avoid pulling or twisting the squash, as this can damage the vine and the squash itself. Acorn squash does not ripen off the vine, so it's important to leave it on the plant until it's fully mature.

As the first frost approaches around mid- November, harvest any remaining squash, even if they're not quite fully ripe. These can still be used, although they may not be as sweet or flavorful as fully ripened squash. Store your harvested squash in a cool, dry place for several months.

Acorn squash, like many plants in the Southeast, can be susceptible to certain pests and diseases. Here are some common problems and how to address them:

Squash Vine Borer *What it looks like:* Wilting vines that suddenly collapse, often with small holes near the base of the plant. You might see a sawdust-like substance near the holes. *What causes it:* Moth larvae that bore into the stems and feed on the plant tissue. They thrive in our long, warm summers. *How to fix/prevent it:* Wrap the base of the stems with foil or netting to prevent the moths from laying eggs. Inject Bacillus thuringiensis (Bt) into the stems to kill the larvae. 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). The humidity in the Southeast makes this a common issue. *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 combination of hot heat, humid humidity, and wet-summer rainfall in the Southeast creates an environment where fungal diseases like powdery mildew can thrive. Regular monitoring and proactive measures, such as proper spacing and watering techniques, are essential to keeping your acorn squash healthy. Also, be vigilant about squash bugs and cucumber beetles, as they can quickly decimate a crop if left unchecked.

Companion planting can be a great way to improve the health and yield of your acorn squash. Corn is a classic companion, providing support for the squash vines to climb. Green beans also work well, as they fix nitrogen in the soil, which benefits the squash. Radishes can help deter pests, while marigolds repel nematodes and other harmful insects.

Avoid planting acorn squash near potatoes or brassicas like cabbage and broccoli. Potatoes compete for nutrients, while brassicas can attract pests that also attack squash. Careful planning can help create a thriving and productive garden ecosystem.