Black-Eyed Susan in Zone 9B — Florida

Black-Eyed Susans are a fantastic addition to any Florida garden. Their bright, cheerful blooms add a pop of color to your landscape, plus they're excellent for attracting pollinators like butterflies and bees. They're also a great choice for cut flower arrangements, bringing a bit of sunshine indoors.

Our Florida gardening calendar is different, and while our summers can be tough with the heat and humidity, planting Black-Eyed Susans at the right time allows them to thrive during our longer, milder seasons. With our 344-day growing season, you'll have plenty of time to enjoy these beauties.

Starting Black-Eyed Susan seeds indoors in Florida is possible, but honestly, with our mild climate, it's often not necessary. If you want a head start, though, you can sow seeds indoors from mid-November through early December, about 8 weeks before transplanting.

Use seed trays with a good seed-starting mix, keep them warm (around 70-75°F), and provide plenty of light – a grow light works best. Water from the bottom to avoid damping off, which can be a problem in our humid conditions. Remember our spring character is reversed, so getting a head start isn't always essential.

Transplant your Black-Eyed Susan seedlings outdoors from mid-January through early February. Before transplanting, be sure to harden them off by gradually exposing them to outdoor conditions for about a week. This helps them adjust to the Florida sunshine and breezes.

Space them 12-18 inches apart in a sunny spot with well-draining soil. Keep an eye on the weather, as we can sometimes get unexpected cold snaps even in January. Buying starts is a great way to enjoy flowers the first year, as they are perennials.

Direct sowing Black-Eyed Susan seeds is an easy and effective method here in Florida. You can sow seeds directly into the garden from mid-January through early October. The advantage of direct sowing is less transplant shock, but the downside is that the seedlings are more vulnerable to pests and weather.

Prepare the soil by loosening it and removing any weeds. Sow seeds 12-18 inches apart and lightly cover them with soil. Keep the soil consistently moist until the seedlings emerge.

Once established, Black-Eyed Susans are very drought-tolerant, which is a huge plus for Florida gardeners. However, they do need consistent watering, especially during our hot, dry spring. During our drier months, give them about an inch of water per week.

The "finger test" is a good way to check if they need watering – stick your finger about 2 inches into the soil; if it feels dry, it's time to water. Water at the base of the plant to avoid wetting the foliage, which can encourage fungal diseases in our humid climate.

In the summer, our wet-summer rainfall usually takes care of the watering, but keep an eye on them during dry spells. Signs of underwatering include wilting leaves, while overwatering can lead to yellowing leaves and root rot. Mulching around the base of the plants helps retain moisture and suppress weeds, but be sure to leave space around the stem to prevent rot.

Deadheading Black-Eyed Susans is key to encouraging more blooms throughout the season. Simply snip off the spent flowers just below the flower head. This prevents the plant from putting energy into seed production and encourages it to produce more flowers.

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

You can expect to start harvesting Black-Eyed Susans for cut flowers from early April through early January. The blooms typically last from midsummer through fall. The best time to harvest is when the flowers are fully open and the petals are firm.

Cut the stems at an angle, leaving several inches of stem on the plant. Place the cut flowers in water immediately to keep them fresh. To encourage continued production, keep deadheading the spent flowers. As the first frost approaches in late December, you can still harvest any remaining blooms, but the plant will soon go dormant.

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. Leaves curl, yellow, and die.
• What causes it: Various fungi thrive in warm days, cool nights, and moderate humidity. Dry leaf surfaces actually favor it. Our humidity makes this a common 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 the leaves that start yellow and turn dark brown or black. Spots may have a light center. Severely affected leaves may drop off.
• What causes it: A fungal disease that thrives in warm, humid conditions and spreads through splashing water. Our wet-summer rainfall makes it prevalent.
• How to fix/prevent it: Remove and destroy infected leaves. Improve air circulation. Water at the base of the plant. Apply a fungicide containing copper or chlorothalonil.

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: The hot heat, very-high humidity, and wet-summer rainfall create ideal conditions for fungal diseases like powdery mildew and septoria leaf spot. Additionally, our sandy soil can drain quickly, so consistent watering is important, especially during dry spells. Nematodes can also be a problem in our soil, so choose nematode-resistant varieties if possible.

Black-Eyed Susans make great companions for several plants in the Florida garden. Tomatoes benefit from the shade provided by Black-Eyed Susans during the hottest part of the day, which can help prevent sunscald. Squash also appreciates the shade, and the flowers attract pollinators that will also pollinate your squash.

Herbs like basil and rosemary are good companions because their strong scents can help deter pests that might otherwise attack the Black-Eyed Susans. Avoid planting them near anything that prefers very dry soil, as Black-Eyed Susans do best with consistent moisture, especially when getting established.