Tansy in Zone 10B — Florida

Tansy is a fantastic addition to your Zone 10B Florida garden, not for the dinner table, but for its powerful insect-repelling properties. Imagine strolling through your yard, free from pesky mosquitos, thanks to this hardy plant. Tansy offers a unique satisfaction, especially in our buggy climate, and its bright yellow flowers add a cheerful touch.

Our Florida gardening calendar is different, with summer being more of a survival mode for many plants. However, Tansy thrives with our reversed seasons. You can easily manage it with proper timing and placement. Our long growing season (nearly 360 days!) gives you ample opportunity to establish this beneficial plant.

Starting Tansy indoors isn't essential in Florida, but it can give you a head start. If you're eager to get a jump on the season, sow seeds indoors from early to late November, about six weeks before you'd like to transplant them outside. Use seed trays with a good seed-starting mix and provide warmth and bright light.

Bottom watering is especially helpful to prevent damping-off. Just set the tray in a shallow dish of water and let the soil soak it up. Remember our spring character is reversed here, so starting early indoors means your seedlings will be ready to go out as our prime growing season begins in the fall.

Transplant your Tansy seedlings outdoors from late December through mid January. This gives them plenty of time to establish before our hotter months arrive. Before transplanting, harden them off by gradually exposing them to outdoor conditions for about a week.

Space your Tansy plants 12-18 inches apart to allow for their clumping growth habit. Keep an eye on the weather; even though we're in Zone 10B, unexpected cool snaps can happen. A little frost protection, like a row cover, can be beneficial during the first few weeks after transplanting.

Direct sowing Tansy is a simple and effective method in Florida. You can sow seeds directly into the garden from late December through early October. This wide window takes advantage of our long growing season.

Prepare the soil by loosening it and removing any weeds. Tansy isn't too picky about soil, but well-draining soil is always best. Scatter the seeds lightly over the surface and gently press them into the soil. Keep the soil consistently moist until the seedlings emerge. Thin seedlings to 12-18 inches apart once they are a few inches tall.

Tansy is incredibly drought-tolerant, making it a great choice for Florida gardens. Once established, it actually thrives on neglect. Overwatering and over-fertilizing can make it even more aggressive, so less is definitely more with this plant.

During our drier fall and winter months, check the soil moisture with the finger test. 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, especially during those drier periods. In the wet summer, you may not need to water at all, thanks to our regular rainfall.

Water at the base of the plant to avoid getting the foliage wet, especially during our humid summers. Overhead watering can encourage fungal diseases. Signs of underwatering include wilting or drooping leaves. Overwatering can lead to root rot, indicated by yellowing leaves and a mushy stem. Mulching around the base of your Tansy plants with pine straw or wood chips helps retain moisture and suppress weeds.

Pruning Tansy is mainly about managing its growth and preventing unwanted spread. Deadhead spent flowers regularly to prevent aggressive self-seeding. Simply snip off the flower heads as they fade.

You can cut back the entire plant in the fall, after the first frost (around late December in Florida), to encourage fresh growth in the spring. Tansy is very vigorous and can become invasive, so you might need to contain it by planting it in a raised bed or using barriers to prevent it from spreading.

You can expect your first Tansy harvest from early March through early January. Tansy is ready to harvest when its button-like yellow flowers bloom in midsummer. While it's not for culinary use (it can be toxic in large amounts), you'll harvest it for its insect-repelling properties.

Simply cut the stems as needed, using sharp, clean pruners. Regular harvesting encourages continued production throughout the growing season. As our first frost approaches in late December, you can cut back the entire plant and dry the stems for use as an insect repellent indoors.

Tansy is generally a low-maintenance plant, but here are a couple of potential problems to watch out for in Florida:

Can be Invasive:

• What it looks like: Tansy spreads rapidly, potentially overtaking other plants in your garden.
• What causes it: Its vigorous growth habit and prolific self-seeding contribute to its invasive tendencies, especially in our long growing season.
• How to fix/prevent it: Plant Tansy in a contained area like a raised bed or use barriers to prevent its roots from spreading. Deadhead spent flowers regularly to prevent self-seeding.

Aphids:

• What it looks like: Clusters of tiny, soft-bodied insects (green, black, or white) on stems and leaf undersides. You might also see sticky honeydew residue and curled or distorted new growth.
• What causes it: Aphids are rapid-reproducing sap-sucking insects. Their populations explode in warm weather. Ant colonies may "farm" them for honeydew.
• How to fix/prevent it: A strong spray of water can knock them off. Encourage natural predators like ladybugs and lacewings. Use insecticidal soap for heavy infestations, or neem oil for a systemic solution. Avoid excess nitrogen fertilizer, as it attracts them.

Florida Specific Challenges: Our hot heat, very-high humidity, and wet-summer rainfall can exacerbate these problems. The humidity can encourage aphid infestations, and the long growing season can allow Tansy to spread more rapidly. Be vigilant and take preventative measures to keep your Tansy healthy and contained.

Tansy makes a great companion plant for several vegetables in your Florida garden. Plant it near potatoes to deter potato beetles. It also benefits squash and cucumbers by repelling squash bugs and cucumber beetles.

Raspberries also enjoy Tansy as a neighbor, as it helps deter raspberry beetles. Avoid planting Tansy near brassicas like cabbage, broccoli, and cauliflower, as it can attract cabbage moths. By choosing the right companions, you can create a thriving and pest-free garden.