Echinacea in Zone 7B — Pacific Northwest

Echinacea, also known as coneflower, is a fantastic addition to any Pacific Northwest garden. Their daisy-like flowers bring beauty and attract pollinators, plus they're relatively low-maintenance once established. The cool nights we often get here actually intensify the colors, making them even more striking.

While we don't have the scorching heat that some regions do, our 193-day growing season is plenty long enough for Echinacea to thrive. You might need to give them a little extra attention early on, but the rewards are well worth it. Don't worry too much about heat; it's rarely above 90°F here.

Starting Echinacea indoors isn't strictly necessary, but it can give you a head start, especially if you're after specific varieties. Sow seeds indoors from mid-February through early March, about eight weeks before you plan to transplant. Use seed trays with a good seed-starting mix, and keep them consistently moist with bottom watering to avoid damping off.

Provide a warm location, ideally around 70-75°F, and plenty of light. Our overcast spring days mean you'll likely need supplemental grow lights. Since our spring soils tend to be cool, transplanting a healthy start can give you an advantage.

Transplant your Echinacea seedlings outdoors from mid-April through early May, after the danger of hard frost has passed. Before planting, harden them off by gradually exposing them to outdoor conditions for about a week. This helps them adjust to the cooler temperatures and brighter sunlight.

Choose a sunny spot with well-drained soil and space plants 18-24 inches apart. Remember that Echinacea is a perennial. Although you can grow from seed, many gardeners in the PNW find it easier to start with purchased transplants, as the seeds need cold stratification for best results.

Direct sowing Echinacea is a viable option in the Pacific Northwest, especially if you're not particular about the variety. Sow seeds directly into the garden from mid-April through mid-July. Make sure the soil is well-drained and has warmed up a bit.

Lightly rake the seeds into the soil, keeping them about 18-24 inches apart, and keep the area consistently moist until germination. Direct sowing is less work upfront, but your plants may take a little longer to establish compared to transplants.

Echinacea is very drought-tolerant once established, making it a great choice for our dry summer months in the Pacific Northwest. During the wet springs, you probably won't need to water at all. Let the rain do its job!

Once the dry summer hits, check the soil moisture using the finger test. Stick your finger about two inches deep into the soil near the base of the plant. If it feels dry, it's time to water. Give them about an inch of water per week during dry spells. Water at the base of the plant to avoid wetting the foliage, which can encourage fungal diseases, even though our dry summers mean humidity is usually low.

Signs of underwatering include wilting leaves and dry, cracked soil. Overwatering can lead to root rot, indicated by yellowing leaves and a mushy base. A layer of mulch around the plants helps retain soil moisture and suppress weeds, which is especially useful during our drier months.

Pruning Echinacea is simple and helps encourage more blooms. Deadhead spent flowers throughout the growing season to promote continuous flowering. Simply snip off the flower heads just below the next set of leaves.

In late winter or early spring, cut back the entire plant to the ground. This allows for fresh new growth in the spring. Alternatively, you can leave some seed heads standing over the winter for visual interest and to provide food for birds.

You can expect to harvest Echinacea flowers from mid-July through early November in our region. Look for flowers that are fully open and vibrant in color. The petals should be firm and not yet starting to fade.

To harvest, cut the stem just below the flower head, leaving as much of the stem as possible on the plant to encourage further growth. You can harvest petals for tea or medicinal purposes. Even as the first frost approaches in late October, Echinacea can still produce blooms if protected. Leaving some seed heads on the plants also provides food for goldfinches.

Here are a few potential problems you might encounter with Echinacea in the Pacific Northwest:

Aster Yellows

• What it looks like: Distorted, greenish flowers and stunted growth. The plant may also develop unusual, broom-like growth.
• What causes it: A phytoplasma (bacteria-like organism) transmitted by leafhoppers. These insects are more common during our mild summers.
• How to fix/prevent it: Unfortunately, there is no cure. Remove and destroy infected plants immediately to prevent the spread. Control leafhopper populations with insecticidal soap if necessary.

Powdery Mildew

• What it looks like: White or grayish powdery coating on leaves, stems, and sometimes fruit. Leaves curl, yellow, and die. Reduces plant vigor.
• What causes it: Various fungi that thrive in warm days, cool nights, and moderate humidity. Dry leaf surfaces actually favor it (unlike most fungi).
• 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.

Japanese Beetles

• What it looks like: Metallic green beetles that skeletonize leaves, leaving a lacy appearance. They can quickly defoliate plants.
• What causes it: Japanese beetles are attracted to damaged or stressed plants.
• How to fix/prevent it: Handpick beetles and drop them into a bucket of soapy water. Use row covers to protect plants. Neem oil can also deter them.

Pacific Northwest Specific Challenges: Our mild heat, dry-summer humidity, and dry-summer rainfall generally favor Echinacea. Late blight isn't a major concern for Echinacea itself, but the cool soil in spring can slow down initial growth. Slugs can be a nuisance, especially with young plants.

Echinacea benefits from companion planting. Tomatoes and peppers make good companions because they enjoy similar full sun conditions and don't compete for nutrients. Herbs like rosemary and thyme can deter pests and attract beneficial insects, further protecting your Echinacea. Avoid planting near anything that will heavily shade them, as they need plenty of sun to thrive.