Black-Eyed Susan in Zone 6B — Great Plains

Black-Eyed Susans are a classic for a reason, and they’re right at home here in Zone 6B. Their bright, cheerful blooms add a splash of color to the prairie landscape, and they're tough enough to handle our variable weather. Plus, they're fantastic for attracting pollinators to your garden.

We all know gardening in the Great Plains comes with its challenges – wind, drought, and the occasional hail storm. But with a good understanding of timing and a little planning, you can absolutely grow beautiful Black-Eyed Susans during our 198-day growing season.

Starting Black-Eyed Susans indoors isn't essential, but it can give you a head start, especially if you want blooms the first year. If you're going this route, start your seeds indoors from late January through mid February, about eight weeks before you plan to transplant them outside.

Use seed trays with a good seed-starting mix, and keep them warm and consistently moist. Bottom watering helps prevent damping off – just set the tray in a shallow dish of water and let the soil soak it up. Keep them under grow lights since our spring weather can be so variable.

Transplanting Black-Eyed Susans outdoors is best done from early April through early May. Before you plant, be sure to harden off your seedlings by gradually exposing them to outdoor conditions for about a week.

Space them 12-18 inches apart in a sunny spot with well-drained soil. Keep an eye on the forecast – we can still get some late frosts or even a surprise hailstorm in early spring, so be prepared to cover your young plants if needed. Remember, since these are perennials, buying starts might be your best bet for blooms the first year.

Direct sowing Black-Eyed Susan seeds is a perfectly viable option, and it's less work than starting them indoors. Sow seeds outdoors from early April through late July.

Prepare the soil by loosening it and removing any weeds. Black-Eyed Susans aren't too picky, but well-drained soil is key. Lightly cover the seeds with soil and keep them moist until they germinate. Thin seedlings to 12-18 inches apart.

Black-Eyed Susans are wonderfully drought-tolerant once they're established, making them perfect for our Great Plains climate. In their first season, however, they'll appreciate consistent watering.

During the spring, aim to water deeply about once a week, providing around 1 inch of water. Use the finger test – stick your finger about 2 inches into the soil. If it feels dry, it's time to water. As summer heats up, especially with our typical highs around 93°F, you might need to water a bit more frequently, but avoid overwatering.

Water at the base of the plants to keep the foliage dry, which helps prevent fungal diseases in our low-to-moderate humidity. Yellowing leaves can indicate overwatering, while wilting leaves signal underwatering. A layer of mulch, like wood chips or straw, can help conserve moisture and suppress weeds.

Pruning Black-Eyed Susans is straightforward. Deadheading, or removing spent flowers, encourages more blooms throughout the season. Simply snip off the flower heads just below the bloom.

You can deadhead throughout the growing season, from midsummer into fall. Alternatively, you can leave some of the seed heads on the plants. The birds will appreciate the seeds, and you'll get some self-seeding for next year. In late winter or early spring, cut back the entire plant to a few inches above the ground to encourage fresh growth.

You can expect your first Black-Eyed Susan blooms starting in late June and continuing through early November. These flowers make excellent cut flowers, adding a cheerful touch to any bouquet.

Harvest the blooms when they are fully open and the petals are vibrant. Cut the stems at an angle in the morning for the longest vase life. Black-Eyed Susans will continue to produce flowers if you keep them deadheaded. As the first frost approaches in late October, you can still harvest any remaining blooms.

Even tough plants like Black-Eyed Susans can have problems. Here are a few to watch out for in the Great Plains:

• Powdery Mildew
• What it looks like: White or grayish powdery coating on leaves, stems, and sometimes fruit. Leaves curl, yellow, and die.
• What causes it: Fungi that thrive in warm days, cool nights, and moderate humidity. Dry leaf surfaces actually favor it. Our extreme temperature swings can make plants more susceptible.
• 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 are tan or brown with dark borders. Spots may merge, causing leaves to yellow, brown, and drop off.
• What causes it: A fungal disease that spreads in wet conditions. Splashing water from rain or irrigation can spread the spores.
• How to fix/prevent it: Remove and destroy infected leaves. Improve air circulation. Water at the base of the plant to avoid wetting the foliage. Fungicides containing copper may help in severe cases.
• 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).

Great Plains Specific Challenges: Our hot summers, low-to-moderate humidity, and variable rainfall can create conditions that favor some of these problems. The wind can also spread fungal spores. Regular monitoring and good air circulation are key to keeping your Black-Eyed Susans healthy.

Black-Eyed Susans are great companions for a variety of plants in the Great Plains garden. Tomatoes benefit from the shade provided by Black-Eyed Susans during our hot summers, which can help prevent sunscald.

Squash also appreciates the ground cover provided by Black-Eyed Susans, which helps retain moisture in our drier climate. Herbs like rosemary and thyme also make good companions, as they attract beneficial insects that can help control pests. Avoid planting Black-Eyed Susans near plants that are susceptible to powdery mildew, as they can potentially spread the disease.