Echinacea in Zone 7B — Northern California

Echinacea, also known as coneflower, is a fantastic addition to any Northern California garden. Not only are they beautiful with their daisy-like blooms, but they also attract pollinators, are drought-tolerant, and the petals can be used to make a soothing tea. Plus, they're perennials, so you'll get to enjoy them year after year!

Our Mediterranean climate with its dry summers presents some unique challenges, but Echinacea is well-suited to handle them. With our long 245-day growing season, you'll have plenty of time to get these beauties established and blooming.

Starting Echinacea indoors isn't strictly necessary in our climate, but it can give you a head start. If you want to get a jump on the season, start your seeds indoors from mid January through early February, about eight weeks before you plan to transplant. Use seed trays with a good seed-starting mix, provide warmth, and make sure they get plenty of light – a grow light is helpful here.

Don't forget to bottom water your seedlings to encourage strong root growth. Since spring comes early here, this method is less common, but if you're eager to get started this is a great option.

Transplant your Echinacea seedlings outdoors from mid March through early April, once the danger of frost has passed. Before planting, harden off your seedlings by gradually exposing them to outdoor conditions for about a week. This helps them adjust to the sun and wind.

Space them about 18-24 inches apart to allow for their clumping growth habit. Keep in mind that Echinacea seeds need cold stratification, so buying starts from a local nursery might be easier than starting from seed.

Direct sowing Echinacea is a perfectly viable option in our mild climate. Sow seeds from mid March through early August. The soil should be at least 60°F for best germination.

Prepare the soil by loosening it and removing any weeds. Sow seeds about ¼ inch deep and keep the soil consistently moist until they germinate. Thin seedlings to 18-24 inches apart once they have a few sets of true leaves. Direct sowing is easy, but you'll need to be patient.

Echinacea thrives on neglect, which is perfect for our dry Northern California summers. Once established, they're very drought-tolerant and prefer well-drained soil. Overwatering is a bigger concern than underwatering.

During the spring, water regularly to help them get established. Once summer hits, back off the watering. Use the "finger test" – stick your finger about 2 inches deep into the soil. If it's dry, it's time to water. Aim for about 1 inch of water per week during the hottest part of the summer, but only if it hasn't rained. Water at the base of the plant to avoid wetting the foliage, which can encourage fungal diseases in our low-humidity environment.

Signs of underwatering include wilting leaves and stunted growth. Overwatering can lead to root rot, indicated by yellowing leaves and a mushy base. Mulching around the base of the plants with wood chips or straw helps retain moisture and suppress weeds.

Pruning Echinacea is simple and helps encourage more blooms. Throughout the season, deadhead spent flowers to encourage the plant to produce more. Simply snip off the flower head just below the spent bloom.

In late winter, after the first frost around mid- November, cut back the entire plant to a few inches above the ground. This will allow for fresh new growth in the spring. Alternatively, leave some seed heads standing over winter for the birds to enjoy and for added winter interest in your garden.

You can expect your first Echinacea harvest from mid June through late November, about 90 days after planting. The flowers will bloom midsummer through fall. The blooms will be vibrant and fully open.

To harvest, simply cut the flower stems near the base of the plant. Leaving some seed heads for the goldfinches is a great way to support local wildlife. You can also harvest the petals for tea by gently pulling them off the flower head and drying them. Continuous harvesting encourages more blooms throughout the season. As the first frost approaches around mid- November, harvest any remaining flowers before they're damaged by the cold.

Here are three common problems you might encounter growing Echinacea in Northern California:

Aster Yellows

• What it looks like: Distorted, greenish flowers, stunted growth, and yellowing leaves.
• What causes it: A phytoplasma (bacteria-like organism) transmitted by leafhoppers. Leafhoppers are more active in warmer months.
• How to fix/prevent it: Unfortunately, there's no cure. Remove and destroy infected plants immediately to prevent the spread. Control leafhopper populations with insecticidal soap.

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). This is less common in our dry climate, but can occur in shady microclimates or during periods of morning fog.
• 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 only the veins behind.
• What causes it: Japanese beetles are attracted to stressed plants.
• How to fix/prevent it: Handpick beetles off plants and drop them into a bucket of soapy water. Apply neem oil to deter them. Consider using traps, but place them away from your garden to avoid attracting more beetles.

Northern California Specific Challenges: Our moderate-to-hot heat and dry summers can stress Echinacea, making them more susceptible to pests and diseases. Proper watering and well-drained soil are key to keeping them healthy. Fire season can also impact plant health due to smoke and poor air quality.

Echinacea benefits from companion planting. Tomatoes and peppers make excellent companions because they attract beneficial insects that prey on Echinacea pests. Herbs like rosemary and lavender also deter pests with their strong scents.

Avoid planting Echinacea near plants that require consistently moist soil, as this can lead to overwatering and root rot.