Acorn Squash in Zone 9B — Texas

Acorn squash is a fantastic addition to your Texas garden. Its sweet, nutty flavor shines in everything from simple roasted dishes to hearty soups, and the satisfaction of harvesting your own winter squash after a long growing season is hard to beat. Plus, it stores well, giving you a taste of homegrown goodness even when the Texas heat has driven you indoors.

Sure, we deal with unpredictable weather and periods of extreme heat here, but with our long 308-day growing season, you've got plenty of time to get a great crop of acorn squash. Careful timing and a few Texas-smart gardening tricks will have you enjoying a fall harvest in no time.

Starting acorn squash indoors is definitely an option, but honestly, with our long growing season, it's usually not necessary unless you're aiming for a super early harvest. If you want a head start, sow seeds indoors from late January through mid February, about three weeks before you'd like to transplant.

Use seed trays with a good seed-starting mix and keep them warm – a heat mat can help. Make sure they get plenty of light; a sunny windowsill might not cut it, so consider grow lights. Water from the bottom to avoid damping off.

Remember, we often get early warmth here, so keep an eye on the weather and be ready to adjust your plans if spring decides to show up early.

If you started your acorn squash indoors, transplant them outdoors from mid February through mid March. Harden them off first by gradually exposing them to outdoor conditions for about a week.

Choose a sunny spot and space the plants 36-48 inches apart, giving them plenty of room to vine. Keep an eye on the weather forecast – those unpredictable freezes can still happen, so be ready to cover your transplants if needed.

Direct sowing is the way to go for most Texas gardeners. You can sow acorn squash seeds directly into the garden from mid February through early September. That's a generous window, taking full advantage of our long growing season.

Choose a spot with full sun and well-drained soil. Amend the soil with compost to give your plants a good start. Plant seeds about an inch deep and space them 36-48 inches apart. Keep the soil consistently moist until the seedlings emerge. Even though winter squash needs a long season, direct sowing avoids transplant shock and lets them establish strong roots right where they'll grow.

Watering is key to success with acorn squash, especially in the Texas heat. They need consistent moisture, but don't like to be soggy.

During the spring and early summer, when we're (hopefully) getting some rain, aim for about 1-2 inches of water per week, either from rainfall or irrigation. Stick your finger about 2 inches deep into the soil – if it feels dry, it's time to water. As the Texas heat cranks up in July and August, you'll likely need to increase watering to 2-3 inches per week, especially if rainfall is scarce.

Water at the base of the plants to avoid wetting the foliage, which can encourage fungal diseases in our variable humidity. Yellowing leaves can indicate overwatering, while wilting leaves (especially in the morning) mean they need more water. A good layer of mulch will help retain moisture and keep the soil cooler.

Get ready to harvest your acorn squash from early May through early December. That long window is one of the perks of gardening in Texas! Acorn squash are typically ready about 85 days after planting.

Look for a dark green skin with a noticeable orange spot where the squash touched the ground. The shell should be hard, and the stem should be dry and starting to crack. Use pruners or a sharp knife to cut the squash from the vine, leaving a few inches of stem attached. Acorn squash don't ripen off the vine, so make sure they're fully mature before harvesting.

As the first frost approaches in early December, harvest any remaining squash, even if they're not quite fully ripe. They might not store as long, but you can still use them.

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

Squash Vine Borer

• What it looks like: Wilting vines, even with adequate watering. You might see small holes in the stem with sawdust-like frass (borer poop) near the base of the plant.
• What causes it: Squash vine borers are moth larvae that tunnel into the stems, disrupting water and nutrient flow. They are active during the warm months.
• How to fix/prevent it: Wrap the base of the stems with foil or fabric to prevent borers from entering. Inject Bacillus thuringiensis (Bt) into the stems to kill borers already inside. You can also try carefully slitting the stem open, removing the borer, and burying the wounded stem section in moist soil to encourage rooting.

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 extreme heat can stress acorn squash plants, making them more susceptible to pests and diseases. Variable humidity can also contribute to fungal problems. Watch plants closely for signs of stress and adjust watering and pest control as needed. Fire ants can also be a nuisance, so keep them under control in your garden.

Companion planting can help your acorn squash thrive in Texas. Corn provides a natural trellis for the vines, and beans fix nitrogen in the soil, benefiting the squash. Radishes can deter pests like squash bugs and cucumber beetles. Marigolds are also great pest deterrents, thanks to their strong scent.

Avoid planting potatoes and brassicas (like broccoli, cabbage, and kale) near acorn squash. Potatoes compete for nutrients, and brassicas can attract pests that will also attack your squash.