Tansy in Zone 7A — Texas

Tansy is a worthwhile addition to any Texas garden, primarily for its pest-repelling properties. It's not for the dinner table, but its strong scent helps keep unwanted insects away from your valuable crops. Plus, it’s super easy to grow, offering a lot of satisfaction for minimal effort.

Our unpredictable weather, including the brutal Texas heat and occasional drought, can be tough on many plants. But Tansy is surprisingly resilient. With our long 245-day growing season, you have plenty of time to get it established and enjoy its benefits.

Starting Tansy indoors gives you a head start, especially if you're aiming for an early bloom. Begin in mid January through early February, about six weeks before you plan to transplant. This is helpful if you want to maximize the growing season.

Use seed trays with a well-draining potting mix. Keep them in a warm spot and provide plenty of light. Bottom watering is a great way to keep the soil consistently moist without damping off. Remember that our spring can arrive early here in Texas, so be ready to move your seedlings outdoors when the time is right.

Transplant your Tansy seedlings outdoors in early to late March. This gives them enough time to get established before the Texas heat really kicks in.

Before transplanting, harden off your seedlings. Gradually expose them to outdoor conditions for about a week. Space them 12-18 inches apart to allow for their clumping growth habit. Keep an eye on the weather forecast – a late freeze can still happen, so be prepared to cover them if needed.

Direct sowing Tansy is a simple and effective method, especially in our Texas climate. You can direct sow from early March through mid August.

Prepare your soil by loosening it and removing any weeds. Sprinkle the seeds lightly over the surface and gently press them into the soil. Tansy prefers soil temperatures around 60-70°F for optimal germination. Direct sowing is less work than starting indoors, but your plants might take a bit longer to mature.

Tansy is very drought-tolerant and thrives on neglect, which is a major plus in Texas. Overwatering is more of a concern than underwatering.

During the spring and fall, when temperatures are milder and rainfall is more likely, you probably won't need to water Tansy much at all. Check the soil using the finger test – stick your finger about 2 inches deep. If the soil feels dry, it's time to water. In the heat of summer, especially if we're experiencing a dry spell, give your Tansy about an inch of water per week. Water at the base of the plant to avoid fungal issues, especially with our variable humidity.

Signs of underwatering include wilting or drooping leaves. Overwatering can lead to yellowing leaves and root rot. Mulching around your Tansy with organic matter like shredded bark can help retain moisture and regulate soil temperature, which is especially useful during our hot summers.

Pruning Tansy is mainly about keeping it under control and encouraging continued growth.

Deadhead the spent flowers to prevent aggressive self-seeding. This is crucial because Tansy can become invasive if left unchecked. Throughout the growing season, remove any dead or damaged foliage. In the fall, after the first frost around mid- November, cut the plant back to the ground. This helps it conserve energy over the winter and encourages new growth in the spring.

You can expect your first harvest of Tansy starting in mid May and continuing through late November. Tansy is ready to "harvest" when it has button-like yellow flowers, which typically bloom in midsummer.

Harvest the stems and leaves by cutting them with a sharp knife or scissors. Avoid pulling, as this can damage the plant. While Tansy isn't for culinary use, you can use the harvested stems and leaves to repel insects around your garden or home. To encourage continued production, regularly harvest the plant throughout the growing season. As the first frost approaches in mid- November, harvest any remaining stems and leaves for use over the winter.

Even though Tansy is easy to grow, you might encounter a couple of problems. Here’s how to deal with them in Texas:

Invasive Growth

• What it looks like: Tansy spreading aggressively beyond its intended area, crowding out other plants.
• What causes it: Tansy is a vigorous grower and self-seeds readily, especially in our long growing season.
• How to fix/prevent it: Contain Tansy by planting it in a raised bed or using underground barriers to prevent its roots from spreading. Deadhead spent flowers to reduce self-seeding. Remove any unwanted seedlings promptly.

Aphids

• What it looks like: Clusters of tiny insects (green, black, or white) on stems and leaf undersides. Sticky honeydew residue. Curled or distorted new growth.
• What causes it: Rapid-reproducing sap-sucking insects. Populations explode in warm weather. Ant colonies may farm them for honeydew.
• How to fix/prevent it: Strong water spray knocks them off. Encourage ladybugs and lacewings (natural predators). Insecticidal soap for heavy infestations. Neem oil works systemically. Avoid excess nitrogen fertilizer (it attracts them). And watch out for those fire ants – they'll protect the aphids!

Texas Specific Challenges: Our hot-to-extreme heat can stress Tansy, making it more susceptible to pests. Variable humidity can either encourage or discourage fungal diseases, so be mindful of watering practices. Unpredictable rainfall means you need to be vigilant about drainage to prevent root rot.

Tansy can be a great companion plant for certain vegetables and fruits in your Texas garden. It's known to repel certain pests, benefiting nearby plants.

Good companions include potatoes, squash, cucumbers, and raspberries. Tansy repels potato beetles, protecting your potato crop. It also helps deter squash bugs and cucumber beetles, keeping your squash and cucumbers healthy. For raspberries, Tansy can help repel certain raspberry pests. Avoid planting Tansy near brassicas like cabbage or broccoli, as it can attract cabbage moths.