Black-Eyed Susan in Zone 7B — Southeast

Black-Eyed Susans are a cheerful addition to any Zone 7B garden, bringing bright color and attracting pollinators all summer long. Their long bloom period makes them excellent cut flowers, and they're tough enough to handle our long summer days. Plus, they'll happily naturalize in your garden, giving you even more to enjoy year after year.

While the Southeast's humidity and occasional pests can be a challenge, Black-Eyed Susans are surprisingly resilient. With a little attention to spacing and watering, you can enjoy their beauty throughout our long 235-day growing season. You'll find that the reliable summer rains often take care of much of the work for you.

Starting Black-Eyed Susans indoors is an option, but honestly, it's often easier to direct sow them here in the Southeast. However, if you want a head start, especially to ensure blooms the first year, starting indoors makes sense.

Begin in early to late January, about eight weeks before you plan to transplant. Use seed trays with a good seed-starting mix and keep them warm—a heat mat helps. Bottom watering is key to prevent damping off. Consistent light, either from a grow light or a very sunny window, is essential. Our spring weather can be moderate, so indoor starts give you extra control.

Transplant your Black-Eyed Susan seedlings outdoors in mid March through early April, after the last frost. Before transplanting, harden them off by gradually exposing them to outdoor conditions for about a week.

Plant them 12-18 inches apart in well-draining soil. Even though they're drought-tolerant, give them a good watering after transplanting to help them settle in. Keep an eye on the weather; a late cold snap can happen, so be prepared to cover them if necessary. If you want flowers the first year, consider buying starts from a local nursery.

Direct sowing Black-Eyed Susan seeds is a simple and effective method in our Southeast climate. You can sow seeds mid March through mid August.

Prepare the soil by loosening it and removing any weeds. Black-Eyed Susans aren't too fussy about soil, but good drainage is important, especially with our clay soil. Scatter the seeds lightly over the surface and gently press them into the 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.

Black-Eyed Susans are wonderfully drought-tolerant once established, making them a great choice for our sometimes unpredictable Southeast weather. However, getting them established requires consistent watering.

During the first few weeks after transplanting or direct sowing, water deeply whenever the top two inches of soil feel dry to the touch – use the finger test. Aim for about an inch of water per week, either from rainfall or irrigation. Once they're established, you can reduce watering frequency significantly.

In our humid climate, it's best to water at the base of the plants to avoid wetting the foliage, which can encourage fungal diseases. Overwatering can lead to root rot, so watch for yellowing leaves as a sign. Underwatering will cause the leaves to wilt and droop. A layer of mulch around the base of the plants will help retain moisture and suppress weeds.

Deadheading Black-Eyed Susans is the key to extending their bloom period. Simply snip off the spent flowers just below the flower head throughout the summer.

If you prefer to leave some seed heads for the birds or to encourage self-seeding, that's perfectly fine too. At the end of the season, after the first frost in early November, cut back the entire plant to a few inches above the ground. This will help tidy up the garden and prepare the plant for winter.

You can expect your first Black-Eyed Susan blooms from early June through mid November, about 75 days after sowing. They make excellent cut flowers, adding a touch of sunshine to any arrangement.

Harvest the flowers when they are fully open and the petals are vibrant. Cut the stems at an angle, leaving several inches of stem on the plant to encourage further blooming. Place the cut flowers in water immediately to keep them fresh. Black-Eyed Susans will continue to produce blooms throughout the summer and fall if you deadhead them regularly. As the first frost approaches in early November, you can still harvest any remaining blooms, knowing the plant will soon go dormant.

Black-Eyed Susans are generally easy to grow, but here in the Southeast, we do face a few common problems:

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. This is common during our late summer and early fall.
• How to fix/prevent it: Improve air circulation with 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: (Missing)
• What causes it: (Missing)
• How to fix/prevent it: (Missing)

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. They love our long, hot summers.
• 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).

Southeast Specific Challenges: Our hot, humid summers and wet-summer rainfall create ideal conditions for fungal diseases. Ensure good air circulation and avoid overhead watering to minimize these problems. Also, keep an eye out for Japanese beetles, which can skeletonize the leaves. Hand-picking them off or using insecticidal soap can help. Deer can also be a nuisance, so consider using deer repellent or fencing.

Black-Eyed Susans make great companions for several plants in the Southeast garden. Tomatoes benefit from the shade and attract pollinators that also help with tomato production. Squash, with its sprawling vines, can act as a living mulch, suppressing weeds around the Black-Eyed Susans. Herbs like basil, rosemary, and thyme can help deter pests with their strong scents. Avoid planting Black-Eyed Susans near plants that are susceptible to the same fungal diseases, as our humid climate can easily spread problems.