Acorn Squash in Zone 8A — Texas

Acorn squash is a rewarding addition to any Texas garden, bringing a touch of fall flavor to your table. Its sweet, nutty taste makes it incredibly versatile in the kitchen, whether roasted, stuffed, or pureed into soup. Plus, there's real satisfaction in harvesting your own winter squash after coaxing it through our long growing season.

Our unpredictable weather and Texas heat can present challenges, but don't let that deter you. With a 260-day growing season, you have plenty of time to get your acorn squash established and producing. Careful timing and attention to watering will set you up for success.

Starting acorn squash indoors isn't essential in our climate, but it can give you a head start, especially if you're aiming for an early harvest. If we have an especially brutal summer coming, getting a jump helps. Start your seeds mid-February through mid-March, about three weeks before you plan to transplant.

Use seed trays with a good seed-starting mix, and keep them warm – around 70-75°F is ideal. A heat mat can be helpful. Make sure they get plenty of light; a sunny windowsill might work, but grow lights are better. When watering, try bottom watering to avoid damping off – just set the tray in a shallow dish of water and let the soil soak it up from the bottom.

Transplant your seedlings outdoors mid-March through mid-April, after the danger of any late freezes 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 Texas sun and wind.

Space your plants 36-48 inches apart, as they need room to sprawl. Keep an eye on the weather forecast. Even though it's past the typical last frost date, those unpredictable cool snaps can still happen.

Direct sowing is the easiest and most common way to grow acorn squash here. Sow your seeds mid-March through mid-August for a fall harvest. The soil temperature should be at least 60°F for good germination.

Prepare your soil by amending it with compost or well-rotted manure. Plant seeds about an inch deep, spacing them 36-48 inches apart. Water gently but thoroughly after planting. Even with our long growing season, keep an eye on the calendar. You'll want to give those squash enough time to mature before our first frost in mid- November.

Acorn squash needs consistent watering, especially during its active growth phase. Aim for about 1 inch of water per week, either from rainfall or irrigation. During the intense Texas heat of summer, you might need to increase that, especially if we're in a drought.

Stick your finger about 2 inches into the soil near the base of the plant. If it feels dry, it's time to water. Water at the base of the plant to avoid wetting the leaves, which can encourage fungal diseases, especially with our variable humidity. Overhead watering is fine, but best done in the morning so the leaves dry quickly.

Watch for signs of underwatering, like wilting leaves, or overwatering, like yellowing leaves. As the fruits mature, you can reduce watering slightly. Mulching around your plants with straw or shredded leaves helps retain moisture in the soil and keeps the roots cooler during the Texas heat.

You can expect your first acorn squash harvest from early June through mid-November, about 85 days after planting. Look for a dark green skin with a noticeable orange spot where the squash has been resting on the ground. This is a good sign of maturity.

The shell should be hard, and the stem should be dry and starting to crack. Use a sharp knife or pruning shears to cut the squash from the vine, leaving a few inches of stem attached. This helps prevent rot.

As our first frost approaches in mid- November, harvest any remaining squash, even if they're not fully mature. Immature squash won't store as long, but you can still use them in cooking.

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

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 (borer poop).
• What causes it: Squash vine borers are moth larvae that tunnel into the stems and feed on the plant's tissue. They're active during the warmer months.
• How to fix/prevent it: Wrap the base of the stems with aluminum foil or netting to prevent the moths from laying eggs. Inject Bacillus thuringiensis (Bt) into the stems to kill the larvae. You can also try removing the borers manually by slitting the stem and extracting them.

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.
• 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.

Texas Specific Challenges: The hot-to-extreme heat can stress acorn squash plants, making them more susceptible to pests and diseases. Variable humidity can also contribute to fungal problems. Unpredictable rainfall can lead to periods of drought followed by flash floods, so it's important to monitor your soil moisture and adjust your watering accordingly. And watch out for fire ants when you're working in the garden!

Companion planting can be a helpful strategy for growing acorn squash. Corn provides a natural trellis for the squash vines to climb, saving space and improving air circulation. Green beans fix nitrogen in the soil, which benefits the squash. Radishes can deter pests like squash bugs and cucumber beetles. Marigolds repel nematodes and other harmful soil pests.

Avoid planting acorn squash near potatoes, as they can compete for nutrients. Also, steer clear of brassicas (like broccoli, cabbage, and kale), as they can attract similar pests and diseases, increasing the risk of problems for both crops.