Black-Eyed Susan in Zone 4A — Midwest

Black-Eyed Susans are worth growing in our Midwest gardens. Their bright yellow petals bring a cheerful pop of color all summer long, and they're fantastic for attracting pollinators. Plus, they make excellent cut flowers to brighten up your home.

Midwest weather can be a mixed bag, with variable springs and summer heat spells. But don't worry, Black-Eyed Susans are pretty adaptable. With our 128-day growing season, you'll have plenty of time to enjoy these beauties.

Starting Black-Eyed Susans indoors is an option, but honestly, they do just fine direct sown. If you're itching to get a head start, aim for starting seeds indoors in early to late March, about 8 weeks before you plan to transplant.

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. Bottom watering helps prevent damping off; just set the tray in a shallow dish of water and let the soil soak it up. With our moderate-to-late springs, indoor starting can give you a bit of an edge, but it's not essential.

Transplanting your Black-Eyed Susan seedlings outdoors should happen in early May through early June, once the danger of frost has passed. Before you commit, harden them off by gradually exposing them to outdoor conditions for about a week.

Plant them 12-18 inches apart in well-draining soil. Keep an eye on the weather; a late frost can still sneak up on us in early May. Black-Eyed Susans are perennials, so buying starts the first year can give you blooms right away.

Direct sowing Black-Eyed Susan seeds is super easy. Wait until mid May through late June, when the soil has warmed up.

Prepare the soil by loosening it and removing any weeds. Scatter the seeds lightly and gently press them into the soil. Keep the soil moist until they germinate. Thin the seedlings to 12-18 inches apart. Direct sowing saves you the hassle of indoor starting, but you might not get blooms until the following year.

Black-Eyed Susans are remarkably drought-tolerant once they're established, which is great for our Midwest summers, especially when those summer heat spells hit. During the first few weeks after planting, water regularly to help them get rooted.

After that, you can usually rely on our wet-summer rainfall to provide enough moisture. Stick your finger about 2 inches into the soil; if it feels dry, it's time to water. Aim for about an inch of water per week, either from rain or watering. Water at the base of the plants to avoid getting the foliage wet, which can encourage fungal diseases in our moderate-to-humid climate.

Yellowing leaves can signal overwatering, while wilting leaves mean they're thirsty. A layer of mulch around the base of the plants helps retain moisture and suppress weeds, a definite plus with our fertile soil.

Pruning Black-Eyed Susans is pretty straightforward. Deadheading, or removing spent flowers, encourages them to produce more blooms throughout the summer.

Simply snip off the flower heads just below the bloom. If you want to attract birds and let them self-seed, leave some of the seed heads on the plants. In late winter, cut back the entire plant to a few inches above the ground to prepare for new growth in the spring.

You can expect your first Black-Eyed Susan blooms from late July through late September, about 75 days after planting. The flowers are ready to harvest when they are fully open and the petals are bright and vibrant.

Cut the stems at an angle, leaving a few inches of stem on the plant to encourage more blooms. Black-Eyed Susans are fantastic cut flowers and will last for several days in a vase. To encourage continued production, keep deadheading spent flowers.

As the first frost approaches in mid- September, let the last flowers go to seed to provide food for birds and allow them to self-seed.

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

Powdery Mildew

• What it looks like: A white or grayish powdery coating on the leaves and stems.
• What causes it: Fungi that thrive in warm days, cool nights, and moderate humidity. It's surprisingly common even in our wet-summer climate because it likes dry leaf surfaces.
• How to fix/prevent it: Improve air circulation by spacing plants properly and pruning. Remove affected leaves. Neem oil or potassium bicarbonate sprays can help. A milk spray (1 part milk to 9 parts water) is surprisingly effective. Plant resistant varieties when possible.

Septoria Leaf Spot

• What it looks like:
• What causes it:
• How to fix/prevent it:

Aphids

• What it looks like: Clusters of tiny green, black, or white insects on stems and leaf undersides. You might also see sticky honeydew residue and curled or distorted new growth.
• What causes it: These sap-sucking insects reproduce rapidly, especially in warm weather. Sometimes ants "farm" them for the honeydew.
• How to fix/prevent it: A strong spray of water can knock them off. Encourage ladybugs and lacewings, which are natural predators. Insecticidal soap works for heavy infestations, and neem oil can be used systemically. Avoid over-fertilizing with nitrogen, as this attracts aphids.

Midwest Specific Challenges: Our moderate-to-hot heat, moderate-to-humid humidity, and wet-summer rainfall can create ideal conditions for fungal diseases like powdery mildew and septoria leaf spot. Good air circulation and proper watering techniques are key to preventing these problems.

Black-Eyed Susans make great companions for several plants in your Midwest garden. Tomatoes benefit from the shade and wind protection that Black-Eyed Susans provide, and the flowers attract pollinators that help with tomato production. Squash also appreciates the shade, and the bright flowers can deter squash vine borers. Herbs like basil and oregano can help repel pests that might bother Black-Eyed Susans.

Avoid planting them near anything that requires very dry soil, as Black-Eyed Susans prefer consistent moisture, especially when young.