Acorn Squash in Zone 7B — Texas

Acorn squash is more than just a pretty face; it's a versatile vegetable that thrives in our Texas gardens, offering a sweet, nutty flavor perfect for roasting, stuffing, or pureeing. The satisfaction of harvesting your own winter squash after battling the Texas heat is hard to beat, and you'll find homegrown tastes far better than anything from the store.

Sure, gardening in Texas comes with its challenges, from unpredictable weather to the blazing sun. However, with our long 255-day growing season and careful timing, you can absolutely succeed in growing delicious acorn squash right here in your backyard.

While direct sowing is generally preferred for acorn squash, starting seeds indoors can give you a jump start, especially if you're aiming for that early summer harvest. Start your seeds late February through mid March, about three weeks before you plan to transplant.

Use seed trays or small pots filled with a good seed-starting mix. Keep them warm (around 70-75°F) and provide plenty of light – a sunny windowsill or grow lights work well. Don't forget to water from the bottom to encourage strong root growth. The early warmth we often get in spring means you need to keep an eye on soil moisture.

Transplant your seedlings outdoors late March through late April, after the last expected frost has passed. Before transplanting, harden off your seedlings by gradually exposing them to outdoor conditions for about a week.

Choose a sunny spot with well-drained soil, and space your plants 36-48 inches apart to allow for their vining growth habit. Keep an eye on the weather forecast – those late-season cool snaps can still happen, so be ready to cover your seedlings if needed.

Direct sowing is the easiest and most common way to grow acorn squash in Texas. Sow your seeds mid March through mid August, giving you a wide window to work with.

Choose a sunny location with well-drained soil. Prepare the soil by amending it with compost or well-rotted manure. Plant seeds 1 inch deep and space them 36-48 inches apart. Soil temperature should be at least 60°F for optimal germination. Water well after planting and keep the soil consistently moist until seedlings emerge. Don't let the Texas heat dry them out.

Acorn squash needs consistent moisture, especially during fruit development, but be careful not to overwater. In the Texas heat, aim for a deep watering two to three times a week, providing about 1-2 inches of water each time, depending on rainfall and humidity.

Stick your finger about 2 inches deep into the soil. 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.

Signs of underwatering include wilting leaves and stunted growth. Overwatering can lead to root rot, indicated by yellowing leaves and a mushy stem base. A good layer of mulch will help retain moisture and regulate soil temperature, protecting your plants from both drought and extreme heat.

You can expect your first acorn squash harvest from early June through mid November, about 85 days after planting. Keep an eye on your plants!

Ripe acorn squash will have a dark green skin with a noticeable orange spot where it rested on the ground. The shell should be hard, and the stem should be dry and firm.

To harvest, use a sharp knife or pruners to cut the squash from the vine, leaving about 2 inches of stem attached. As our first frost approaches in mid- November, harvest any remaining squash, even if they aren't fully ripe – they can still be used in soups and stews.

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 stem and frass (sawdust-like excrement) present.
• What causes it: The larvae of a moth that burrows into the stem and feeds on the plant's tissue. They thrive in our long, warm growing season.
• How to fix/prevent it: Wrap the base of the stem with aluminum foil or nylon stockings to prevent the moth from laying eggs. Inject Bacillus thuringiensis (Bt) into the stem to kill the larvae.

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.

Texas Specific Challenges: The hot-to-extreme heat can stress acorn squash plants, making them more susceptible to pests and diseases. Variable humidity can promote fungal growth, and unpredictable rainfall can lead to either drought or waterlogged soil. Fire ants can also be a nuisance, so keep an eye out for their mounds and treat them as needed.

Companion planting can help your acorn squash thrive. Corn provides a natural trellis for the vines, while beans fix nitrogen in the soil, benefiting the squash. Radishes can help deter squash bugs and cucumber beetles, and marigolds repel nematodes and other soil pests.

Avoid planting acorn squash near potatoes or brassicas (like cabbage and broccoli), as they can compete for nutrients and attract similar pests.