Black-Eyed Susan in Zone 8B — Florida

Black-Eyed Susans bring a burst of sunshine to your Florida garden, thriving even when the summer heat is on. These beauties are easy to grow, attract pollinators, and make wonderful cut flowers, adding a cheerful touch to your home throughout much of the year.

Our Florida gardening calendar is different, and while we face challenges like humidity and sandy soil, you can absolutely grow Black-Eyed Susans successfully here. With a 303-day growing season, careful timing will help you enjoy these vibrant blooms.

Starting Black-Eyed Susans indoors is an option, especially if you're eager to get a head start. Sow seeds early to late December, about 8 weeks before the time you want to transplant them.

Use seed trays filled with a good seed-starting mix. Keep them warm and provide plenty of light, either from a sunny window or a grow light. Bottom watering helps prevent damping off, which can be a problem in our humid climate. Remember, our spring is reversed, so starting early gives you blooms before the worst of the summer heat.

Transplant your Black-Eyed Susan seedlings outdoors early February through early March. Before planting, harden them off by gradually exposing them to outdoor conditions for about a week.

Space the plants 12-18 inches apart in a sunny spot with well-draining soil. Be mindful of late cold snaps that can sometimes surprise us this time of year, and protect young plants if needed. As a perennial, buying starts may give you flowers sooner, but be sure to check for nematode-resistant varieties.

Direct sowing Black-Eyed Susan seeds is an easy and reliable method here in Florida. Sow seeds mid February through mid September.

Prepare the soil by loosening it and removing any weeds. Scatter the seeds and lightly cover them with soil. Keep the soil consistently moist until the seedlings emerge. You'll want to space them 12-18 inches apart. Direct sowing is convenient, but you'll need to be diligent about weeding and protecting the young plants from pests.

Black-Eyed Susans are drought-tolerant once established, making them a great choice for Florida gardens. During the cooler months (fall, winter, and early spring), water deeply about once a week if we haven't had rain.

In the hotter, wetter summer months, you may not need to water at all unless we experience a dry spell. Use the "finger test" – stick your finger about 2 inches into the soil; if it feels dry, it's time to water. Aim for about 1 inch of water per week.

Water at the base of the plants to avoid wetting the foliage, which can encourage fungal diseases in our humid climate. Signs of underwatering include wilting leaves, while overwatering can lead to yellowing leaves and root rot. A good layer of mulch will help retain moisture and suppress weeds.

Pruning Black-Eyed Susans is straightforward. Deadhead spent flowers throughout the blooming season to encourage more blooms.

Simply snip off the flower heads just below the bloom. You can deadhead throughout the growing season. If you want to leave some seed heads for the birds or to allow the plants to self-seed, that's fine too. Cut the plants back to the ground in late winter (late January through mid-February) to prepare them for new growth in the spring.

You can expect to harvest your first Black-Eyed Susan blooms early May through late December here in Zone 8B. The flowers are ready to harvest when they are fully open and the petals are vibrant.

Cut the stems at an angle, leaving several inches of stem on the plant. This encourages continued production. Harvest regularly to keep the plants blooming. As the first frost approaches in mid- December, you can harvest any remaining blooms to enjoy indoors.

Black-Eyed Susans are generally easy to grow, but here are a few common problems you might encounter in Florida:

Powdery Mildew

• What it looks like: White or grayish powdery coating on leaves, stems. Leaves curl, yellow, and die.
• What causes it: Fungi thrive in warm days, cool nights, and moderate humidity. Dry leaf surfaces actually favor it. Our high humidity can make this a recurring issue.
• 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.

Septoria Leaf Spot

• What it looks like: Small, circular spots on leaves that start out yellow or brown and eventually turn dark brown or black. Spots may have a light center and a dark border. Severely affected leaves will yellow, wither, and drop.
• What causes it: A fungal disease that thrives in warm, humid conditions and spreads through splashing water. Overcrowding and poor air circulation can worsen the problem.
• How to fix/prevent it: Remove and destroy infected leaves. Improve air circulation by spacing plants adequately. Water at the base of the plants to avoid wetting the foliage. Apply a fungicide if necessary, following label instructions.

Aphids

• What it looks like: Clusters of tiny soft-bodied 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).

Florida Specific Challenges: Our hot, humid summers and wet-summer rainfall create an ideal environment for fungal diseases like powdery mildew and septoria leaf spot. Be vigilant about air circulation and avoid overhead watering to minimize these problems. Also, be sure to amend our sandy soil with plenty of organic matter to improve drainage and nutrient retention.

Black-Eyed Susans make great companions for several plants in your Florida garden. Tomatoes benefit from the shade and windbreak provided by Black-Eyed Susans, and the flowers attract pollinators that also help with tomato production. Squash also appreciates the partial shade, which can help prevent sunscald. Herbs like basil and oregano can help deter pests that might bother Black-Eyed Susans.

Avoid planting Black-Eyed Susans near plants that are susceptible to the same fungal diseases, such as cucumbers. This can increase the risk of disease spread in our humid environment.