Echinacea in Zone 4B — Mountain West

Echinacea, also known as coneflower, is a fantastic addition to any high altitude garden. Not only are the vibrant flowers beautiful in bouquets, but they also attract pollinators and the seed heads feed the goldfinches through the winter. Plus, Echinacea is drought-tolerant and thrives in our alkaline soil, making it a perfect fit for the Mountain West.

Our short growing season and intense sun can be challenging, but Echinacea is surprisingly adaptable. With a little planning and attention to timing, you can enjoy these cheerful blooms from midsummer through fall. You have about 128 days to work with, so let's get started!

Starting Echinacea indoors gives you a head start in our short season, but it's not essential. If you're eager to see blooms as early as possible, or want to grow a specific variety, starting indoors is a good choice.

Begin starting seeds indoors mid-March through early April, about 8 weeks before you plan to transplant. Use seed trays with a good seed-starting mix, provide warmth (a heat mat helps), and ensure they get plenty of light. Bottom watering is a great way to keep the seedlings consistently moist without overwatering. Remember, our late springs mean you'll need to keep an eye on the weather before moving them outside.

Transplanting Echinacea outdoors should happen mid-May through early June, after the risk of hard frost has passed. Before planting, harden off your seedlings by gradually exposing them to outdoor conditions for about a week.

Choose a sunny spot with well-drained soil and space the plants 18-24 inches apart. Be mindful of late-season temperature swings. Echinacea is a perennial, but starting with established plants often gives faster, more reliable results, especially since the seeds need cold stratification to germinate well.

Direct sowing Echinacea is an option, but germination can be a bit less predictable. Sow seeds mid-May through early June, once the soil has warmed up.

Prepare the soil by loosening it and removing any weeds. Sow seeds about 1/4 inch deep and keep the soil consistently moist until they germinate. Thin seedlings to 18-24 inches apart. Direct sowing is more hands-off, but remember that you may not see blooms until the following year.

Echinacea is remarkably drought-tolerant once established, making it ideal for our dry Mountain climate. Overwatering is a far bigger threat than underwatering.

During the first few weeks after transplanting or when direct-sown seedlings are young, water regularly to help them establish. After that, let the soil dry out between waterings. Use the "finger test" – stick your finger into the soil about 2 inches deep. If it's dry, it's time to water. Generally, an inch of water per week is plenty, and you may need even less during cooler periods.

Water at the base of the plant to avoid wetting the foliage, which can encourage fungal diseases, even in our low-humidity environment. Signs of underwatering include drooping leaves and stunted growth, while overwatering can lead to yellowing leaves and root rot. A light mulch of gravel or pine needles can help retain moisture without suffocating the roots.

Pruning Echinacea is simple and mostly about aesthetics. Deadhead spent flowers throughout the growing season to encourage more blooms. Just snip off the faded flower heads below the next set of leaves.

Alternatively, you can leave some seed heads on the plants to provide food for birds and add winter interest to your garden. Cut back the entire plant to the ground in late winter or early spring before new growth emerges.

You can expect your first Echinacea harvest from mid-August through late September, about 90 days after planting. The flowers are ready to harvest when they are fully open and the petals are vibrant.

To harvest, cut the stems just above a leaf node, leaving enough stem for the plant to continue growing. You can harvest the petals for tea or medicinal purposes. Even as the first frost approaches in mid- September, Echinacea will still look beautiful in your garden. Leave some seed heads for the goldfinches to enjoy throughout the winter.

Here are some common problems you might encounter with Echinacea in the Mountain West:

Aster Yellows

• What it looks like: Distorted, greenish flowers with tufts of growth in the center. The plant may also be stunted.
• What causes it: A disease transmitted by leafhoppers.
• How to fix/prevent it: Unfortunately, there's no cure. Remove and destroy infected plants immediately to prevent the disease from spreading. Control leafhopper populations with insecticidal soap.

Powdery Mildew

• What it looks like: White or grayish powdery coating on leaves, stems, and sometimes flower buds. Leaves may curl, yellow, and die.
• What causes it: Various fungi that thrive in warm days, cool nights, and moderate humidity. Dry leaf surfaces actually favor it.
• How to fix/prevent it: Improve air circulation by spacing plants appropriately. 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.

Japanese Beetles

• What it looks like: Metallic green beetles that skeletonize leaves and flowers.
• What causes it: Japanese beetles are attracted to the scent of Echinacea and can quickly defoliate plants.
• How to fix/prevent it: Handpick beetles and drop them into a bucket of soapy water. Use insecticidal soap or neem oil as a preventative measure. Floating row covers can protect plants during peak beetle activity.

Mountain West Specific Challenges: Our intense UV radiation can sometimes stress Echinacea, making it more susceptible to pests and diseases. Make sure plants are well-watered (but not overwatered!) and consider providing some afternoon shade during the hottest part of the day, especially for newly transplanted seedlings.

Echinacea makes a great companion plant for several vegetables and herbs in our Mountain gardens. Tomatoes and peppers benefit from the shade provided by Echinacea, which can help prevent sunscald in our intense sunlight.

Herbs like rosemary, thyme, and sage are also good companions because they attract beneficial insects that prey on pests. Avoid planting Echinacea near plants that require consistently moist soil, as it prefers drier conditions.