Black-Eyed Susan in Zone 10B — Florida

Black-Eyed Susans bring a burst of sunshine to your Florida garden. They're perfect for attracting pollinators, adding cheerful color to beds and borders, and providing long-lasting cut flowers. Plus, they're relatively low-maintenance, fitting right into our sometimes unpredictable gardening schedules here in Zone 10B.

Our Florida gardening calendar is different, and we know summer is the slow season. But don't worry, with a little planning, you can enjoy these beauties blooming from late spring well into fall. Our 360-day growing season gives you plenty of opportunity to succeed with Black-Eyed Susans.

Starting Black-Eyed Susan seeds indoors isn't essential in our climate, but it can give you a head start. If you want to get a jump on blooms, sow seeds indoors from late October through mid November, about eight weeks before you'd like to transplant them outside.

Use seed trays with a good seed-starting mix, and keep them in a warm spot with plenty of light – a sunny windowsill or under grow lights works well. Remember to water from the bottom to prevent damping off and keep the humidity levels consistent. Because our spring character is reversed, this can help you get blooms earlier than direct sowing.

Transplant your Black-Eyed Susan seedlings outdoors from late December through late January. Before you plant them in the ground, harden them off by gradually exposing them to outdoor conditions for about a week. This will help them adjust to the Florida sunshine and temperatures.

Space the plants 12-18 inches apart in well-draining soil. Keep an eye on the weather during this time; we sometimes get unexpected cold snaps even in Zone 10B, so be prepared to cover your transplants if necessary. As a perennial, buying starts can get you blooms the first year, otherwise you'll need to wait until the second year.

Direct sowing Black-Eyed Susan seeds is a simple and effective method, especially in our mild Florida winters. You can sow seeds directly into the garden from early January through early October. The earlier part of this range gives them a chance to get established before the summer heat hits.

Prepare the soil by loosening it and removing any weeds. Sprinkle the seeds evenly over the surface and lightly cover them with soil. Keep the soil consistently moist until the seedlings emerge. Thin the seedlings to 12-18 inches apart once they are a few inches tall. Direct sowing is easy, but you might have to wait for the second year to see blooms.

Black-Eyed Susans are drought-tolerant once established, making them a great choice for Florida gardens. However, they do need consistent moisture, especially when they're young. During our drier spring and fall months, water deeply about once a week, providing about an inch of water.

Use the "finger test" to check the soil moisture: stick your finger about two inches into the soil. If it feels dry, it's time to water. During our wet-summer months, you may not need to water at all, unless we're experiencing a dry spell.

Water at the base of the plants to avoid wetting the foliage, which can encourage fungal diseases in our humid climate. Overwatering can lead to root rot, so watch out for yellowing leaves or wilting, even when the soil is moist. Add a layer of mulch around the plants to help retain moisture and suppress weeds.

Pruning Black-Eyed Susans is straightforward. Deadhead spent flowers throughout the growing season to encourage more blooms. Simply cut the flower stem back to a leaf node.

If you want to attract birds or allow the plants to self-seed, you can leave some of the seed heads intact. In late winter, after the first frost (around late December in Florida), cut the plants back to a few inches above the ground to promote fresh growth in the spring.

You can expect your first Black-Eyed Susan blooms around late March through early January, about 75 days after sowing or transplanting. The flowers bloom from midsummer through fall. The blooms are ready to harvest when the petals are fully open and the colors are vibrant.

Cut the stems at an angle, leaving a few inches of stem on the plant to encourage new growth. Black-Eyed Susans make excellent cut flowers and will last for several days in a vase.

To encourage continuous production, keep deadheading spent flowers. As the first frost approaches in late December, you can collect seeds from the dried flower heads to sow next season.

Here are some common problems you might encounter with Black-Eyed Susans in Florida:

Powdery Mildew

• What it looks like: White or grayish powdery coating on leaves, stems, and sometimes flower buds. Leaves may curl, yellow, and eventually die.
• What causes it: Various fungi thrive in warm days, cool nights, and moderate to high humidity. Dry leaf surfaces actually favor powdery mildew, which is why it can be prevalent even with our very-high humidity.
• How to fix/prevent it: Improve air circulation by spacing plants adequately and pruning to open up the plant. Remove and destroy affected leaves. Neem oil or potassium bicarbonate sprays can help control the spread. A milk spray (1 part milk to 9 parts water) can also be surprisingly effective.

Septoria Leaf Spot

• What it looks like: Small, circular spots on the leaves that start as dark brown or black and eventually develop a gray or tan center with a dark border. Severely affected leaves may turn yellow and drop off.
• What causes it: A fungal disease that thrives in warm, humid conditions and spreads through splashing water. Overcrowding and poor air circulation can exacerbate the problem.
• How to fix/prevent it: Remove and destroy infected leaves to prevent the spread of the disease. Avoid overhead watering and ensure good air circulation around the plants. Fungicides containing copper or chlorothalonil can be used as a preventative measure.

Aphids

• What it looks like: Clusters of tiny, soft-bodied insects (green, black, or white) on stems and leaf undersides. You might also notice a sticky honeydew residue or curled and distorted new growth.
• What causes it: Rapidly reproducing sap-sucking insects. Populations explode in warm weather, and ant colonies may farm them for honeydew.
• How to fix/prevent it: A strong water spray can knock aphids off the plants. Encourage natural predators like ladybugs and lacewings. Insecticidal soap can be used for heavy infestations, and neem oil works systemically. Avoid excess nitrogen fertilizer, as it attracts aphids.

Florida Specific Challenges: Our hot heat, very-high humidity, and wet-summer rainfall create ideal conditions for fungal diseases like powdery mildew and septoria leaf spot. Monitor your plants regularly and take preventative measures to minimize these issues. Also, our sandy soil can drain quickly, so regular watering is essential, especially during dry spells.

Black-Eyed Susans make great companions for tomatoes and squash in your Florida garden. They attract pollinators that benefit both crops, and their bright colors add a cheerful touch. Herbs like basil and rosemary also make good companions, as they can help repel some common pests.

Avoid planting Black-Eyed Susans near plants that are susceptible to the same fungal diseases, such as cucumbers, as this can increase the risk of spreading the infection.