Mint in Zone 8A — Texas

Mint is a fantastic herb to grow here in Texas. The fresh, vibrant flavor brightens up everything from sweet tea on a hot day to savory lamb dishes. Plus, it's incredibly rewarding to step outside and snip fresh mint for your own recipes.

Our unpredictable weather can be a challenge, but with a little planning, you can absolutely grow mint successfully. Our long 260-day growing season gives you plenty of time to get a good harvest, even with the occasional temperature swing.

Starting mint from seed indoors is an option, but honestly, it's often easier to buy a start from a local nursery or get a division from a gardening friend. If you are set on starting from seed, do it early to late January, about 8 weeks before you plan to transplant.

Use seed trays with a good seed-starting mix. Keep them consistently moist, and bottom watering can help with that. You'll need a warm location and supplemental light since our daylight hours are still short that time of year. Remember, spring comes early here, so getting a head start is key.

Transplant your mint seedlings outdoors early March through early April, after the last expected frost. Be sure to harden them off for about a week before planting them in the ground. Gradually expose them to outdoor conditions a little longer each day.

Space your mint plants about 18-24 inches apart. Mint spreads aggressively, so seriously consider planting it in a container to keep it from taking over your garden. Our weather can still be a bit unpredictable at this time, so keep an eye on the forecast for any unexpected freezes.

Mint loves moist soil, which can be a bit of a challenge with our Texas heat. During the hottest part of the summer, you'll likely need to water your mint every other day, maybe even daily if it's in full sun. In the spring and fall, you can usually get away with watering every 2-3 days.

Stick your finger about 2 inches deep into the soil. If it feels dry, it's time to water. Aim for about 1 inch of water per week, either from rainfall or irrigation. Water at the base of the plant to avoid getting the leaves wet, especially with our variable humidity.

If the leaves start to wilt and turn yellow, you're likely overwatering. If the leaves are dry and crispy, you're underwatering. Mulching around your mint plants with a layer of compost or shredded bark will help retain moisture and keep the soil cool during the brutal Texas heat.

Pruning mint is essential, not only for harvesting but also for controlling its aggressive growth. Regularly cutting back stems encourages bushier growth and prevents flowering, which can diminish the flavor of the leaves.

Throughout the growing season, harvest entire stems as needed, cutting them back to just above a leaf node. This will encourage new growth. As the first frost approaches around mid- November, give your mint plant a final trim to remove any dead or damaged foliage. This prepares it for its dormant period.

You can expect your first harvest of mint from early May through late June, about 60 days after planting. The best time to harvest is before the plant starts to flower, as the leaves are most flavorful then.

Look for healthy, vibrant green leaves. To harvest, simply snip off the stems with scissors or pruning shears. Pinching off the flower buds will also encourage continued leaf production.

As the first frost approaches in mid- November, harvest as much mint as you can and preserve it by drying or freezing. You can also try to overwinter some in a container indoors.

Mint can be susceptible to a few problems here in Texas:

Rust

• What it looks like: Rusty orange, yellow, or brown pustules on leaves and stems, mostly on undersides. Leaves yellow and drop prematurely.
• What causes it: Various rust fungi that spread via wind-borne spores. Favored by warm, humid conditions with moisture on leaves.
• How to fix/prevent it: Remove affected leaves. Avoid overhead watering. Improve air circulation. Apply sulfur or copper fungicide. Don't work among wet plants. Rotate crops.

Spider Mites

• What it looks like: Fine stippling on leaves (tiny white dots). Fine webbing on leaf undersides and between stems. Leaves turn bronze or yellow.
• What causes it: Tiny arachnids that thrive in hot, dry conditions. Populations explode in drought stress.
• How to fix/prevent it: Strong water spray (daily for a week) is the best treatment. Increase humidity around plants. Neem oil or insecticidal soap. Release predatory mites (Phytoseiulus persimilis). Avoid broad-spectrum pesticides that kill predators.

Invasive Spreading

• What it looks like: Mint popping up everywhere you don't want it, even in other garden beds or your lawn.
• What causes it: Mint spreads via underground runners. It's very aggressive and can quickly take over an area.
• How to fix/prevent it: Plant mint in containers only. Bury the container in the ground if desired, but make sure the rim is above the soil line to prevent runners from escaping. If it escapes, dig up and remove all runners immediately.

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.

Texas Specific Challenges: The hot-to-extreme heat can stress mint, making it more susceptible to pests and diseases. Variable humidity can also contribute to fungal problems. Drought conditions can lead to spider mite infestations. Regular watering and good air circulation are key to keeping your mint healthy here in Texas. Keep an eye out for fire ants, as they can sometimes nest around container plants.

Mint is a great companion plant for tomatoes and peppers because its strong scent can help deter pests like aphids and flea beetles. It also works well with cabbage and broccoli, helping to repel cabbage moths.

Avoid planting mint near parsley or chamomile. Mint can inhibit the growth of parsley, and chamomile prefers drier conditions than mint thrives in. Planting them together will create competition and stress for both plants.