Black-Eyed Susan in Zone 7A — Pacific Northwest

Black-Eyed Susans are a fantastic choice for adding late-season color to your Pacific Northwest garden. Their cheerful yellow blooms brighten up any space, and they're incredibly low-maintenance once established. Plus, with our cool nights, the colors often deepen beautifully, making them even more stunning in the fall.

Our mild summers and wet springs can present some unique gardening challenges. But with the right timing, you can easily grow thriving Black-Eyed Susans within our 183-day growing season. Don’t be intimidated – these flowers are surprisingly resilient here.

Starting Black-Eyed Susans indoors isn't strictly necessary in our region, but it can give you a jump start, especially if you want blooms the first year from seed. If you're going this route, sow your seeds indoors from early February through early March, about eight weeks before you plan to transplant them outdoors.

Use seed trays with a good seed-starting mix, and keep them consistently moist. Bottom watering can help prevent damping off, which can be an issue with our overcast spring days. A heat mat and grow lights will provide the warmth and light they need to germinate and grow strong seedlings before transplanting.

Transplant your Black-Eyed Susan seedlings outdoors from mid-April through mid-May, once the danger of frost has passed. Be sure to harden them off for about a week beforehand by gradually exposing them to outdoor conditions. This helps them adjust to the cooler temperatures and stronger sunlight.

Space them about 12-18 inches apart to allow for good air circulation. While we don't often get scorching heat, a bit of spacing helps prevent fungal issues. Remember that Black-Eyed Susans are perennials, so buying starts might get you flowers the first year.

Direct sowing Black-Eyed Susan seeds is a perfectly viable option in the Pacific Northwest. Wait until mid-April through late July, when the soil has warmed up a bit, to sow directly into your garden.

Prepare the soil by loosening it and removing any weeds. Gently press the seeds into the soil, but don't bury them too deeply – they need light to germinate. Keep the soil consistently moist until the seedlings emerge. Thin seedlings to 12-18 inches apart.

Black-Eyed Susans are wonderfully drought-tolerant once they're established, making them perfect for our dry summer months. During the wet springs, you likely won't need to water them at all unless you're experiencing an unusually dry spell.

Once the dry summer hits, check the soil moisture regularly. Stick your finger about two inches deep into the soil; if it feels dry, it's time to water. Aim for about an inch of water per week, either from rainfall or supplemental watering.

Water at the base of the plants rather than overhead to minimize the risk of fungal diseases in our typically dry-summer climate. Overwatering can be just as harmful as underwatering, so watch for signs like yellowing leaves. A layer of mulch around the base of the plants can help retain moisture and suppress weeds.

Deadheading is key to keeping your Black-Eyed Susans blooming longer. Simply snip off the faded flowers just below the flower head. This encourages the plant to produce more blooms throughout the season.

Alternatively, you can leave some of the seed heads on the plants in the fall. Birds love to eat the seeds, and the plants will self-seed, giving you more flowers in future years. In late winter, cut the plants back to the ground to make way for new growth in the spring.

You can expect your Black-Eyed Susans to start blooming from early July through late October here in the Pacific Northwest. This makes them a great addition for late-season color.

Cut the flowers when they are fully open for the longest vase life. Use clean, sharp scissors or pruners to avoid damaging the plant. Cut the stems at an angle just above a leaf node.

Harvesting regularly will encourage the plant to produce more flowers. As the first frost approaches around mid-October, you can cut back the entire plant to encourage new growth next spring.

Here are some common issues you might encounter with Black-Eyed Susans in the Pacific Northwest:

Powdery Mildew

• What it looks like: A white or grayish powdery coating on leaves, stems, and sometimes buds. Leaves may curl, yellow, and eventually die.
• What causes it: Fungi that thrive in warm days, cool nights, and moderate humidity. Surprisingly, dry leaf surfaces favor it.
• How to fix/prevent it: Improve air circulation by spacing plants adequately and pruning if needed. Remove affected leaves promptly. Neem oil or potassium bicarbonate sprays can help. A milk spray (1 part milk to 9 parts water) is also surprisingly effective.

Septoria Leaf Spot

• What it looks like: Small, circular spots on leaves that start as light brown or gray with a dark border, and may enlarge and merge. Severely affected leaves turn yellow and drop.
• What causes it: A fungal disease spread by splashing water, infected plant debris, and contaminated tools. Thrives in humid conditions.
• How to fix/prevent it: Remove and destroy infected leaves promptly. Avoid overhead watering to reduce leaf wetness. Improve air circulation around plants. Apply a fungicide containing copper or chlorothalonil as a preventative measure in wet weather. Clean gardening tools regularly.

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 can explode during our mild summers. Ant colonies may farm them for honeydew.
• How to fix/prevent it: A strong spray of water from your hose can knock them off. Encourage ladybugs and lacewings (natural predators). Insecticidal soap is effective for heavy infestations. Neem oil works systemically.

Pacific Northwest Specific Challenges: Our dry-summer climate generally helps minimize fungal diseases on Black-Eyed Susans, but our wet springs can create favorable conditions for powdery mildew and leaf spot early in the season. Slugs can also be a nuisance, especially for young plants. Be vigilant about monitoring your plants and taking action at the first sign of trouble.

Black-Eyed Susans make great companions for a variety of plants in the Pacific Northwest garden. Tomatoes benefit from the shade and wind protection offered by Black-Eyed Susans, and the flowers attract pollinators that help with fruit set. Squash also appreciates the shade, which can prevent sunscald on the fruits.

Herbs like rosemary and thyme are good companions as well. Their strong scents can help deter pests that might otherwise bother your Black-Eyed Susans. Avoid planting them near anything that requires constantly moist soil, as Black-Eyed Susans prefer drier conditions.