Echinacea in Zone 9A — Southern California

Echinacea, also known as coneflower, is a fantastic addition to any Southern California garden. Its vibrant blooms bring beauty and attract pollinators, while its medicinal properties offer a practical benefit – you can even harvest the petals for tea! Plus, it's a perennial, so you'll enjoy its beauty for years to come.

Our SoCal climate can be challenging, with drought and intense summer heat inland. But with its drought tolerance and long growing season (322 days!), Echinacea is well-suited to thrive here, bringing a splash of color from spring all the way into late fall.

Starting Echinacea indoors can give you a head start, but it's not essential in our mild climate. If you want to try it, sow seeds indoors from late November through late December, about eight 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 is a great way to keep the soil moist without disturbing the delicate seedlings. Just set the tray in a shallow dish of water and let the soil soak it up from the bottom. Given our very-early spring, indoor starting allows you to get flowers even sooner.

Transplant your Echinacea seedlings outdoors from early to late February. Before planting, harden them off by gradually exposing them to outdoor conditions for about a week. This helps them adjust to the sun and wind.

Plant them 18-24 inches apart in a sunny spot with well-drained soil. While we rarely get hard freezes, keep an eye on the weather forecast and cover them if a cold snap threatens. Echinacea needs cold stratification to germinate, which is why buying starts is often easier than from seed.

Direct sowing Echinacea is a viable option in our mild climate, and can be done from early February through early September. Prepare the soil by loosening it and removing any weeds. Sow the seeds about ¼ inch deep and keep the soil consistently moist until they germinate.

Keep in mind that direct-sown plants may take a bit longer to bloom than transplants. Thin the seedlings to 18-24 inches apart once they emerge. Direct sowing is easier, but you might get uneven germination.

Echinacea is wonderfully drought-tolerant once established, making it perfect for our water-wise gardens. During our winter-wet season, you likely won't need to water at all unless we're experiencing a particularly dry spell.

In the spring and fall, water deeply about once a week if there hasn't been significant rainfall. During the hot summer months inland, you might need to water twice a week, especially for younger plants. Use the finger test – if the top 2 inches of soil feel dry, it's time to water. Aim for about 1 inch of water per week.

Water at the base of the plant to avoid wetting the foliage, which can encourage fungal diseases in our low-to-moderate humidity. Mulching around the base of the plant with compost or wood chips helps retain moisture in our dry climate and suppress weeds. Signs of underwatering include wilting leaves and stunted growth. Overwatering can lead to root rot, so make sure the soil is well-draining.

Echinacea benefits from regular deadheading to encourage more blooms. Simply snip off the spent flowers just below the flower head throughout the growing season. This directs the plant's energy into producing more flowers rather than seeds.

However, you can also leave some of the seed heads on the plant for the birds, especially goldfinches, which love to feast on them. In late winter, after the first frost around mid- December, cut back the entire plant to the ground to prepare it for new growth in the spring.

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

To harvest, simply cut the stem just below the flower head. You can use the petals fresh or dry them for tea. Leave some seed heads on the plants for the birds to enjoy and to allow for natural reseeding. Even as the first frost approaches in mid- December, you can still harvest any remaining flowers.

Here are a few common problems you might encounter with Echinacea in Southern California:

Aster Yellows

• What it looks like: Distorted, greenish flowers, stunted growth, and yellowing leaves.
• 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 spread. Control leafhoppers with insecticidal soap or neem oil.

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 behind a lacy appearance.
• What causes it: Japanese beetle larvae feed on roots, and the adults feed on foliage.
• How to fix/prevent it: Handpick beetles off plants and drop them into soapy water. Use Japanese beetle traps, but place them away from your desirable plants to avoid attracting more beetles. Neem oil can also deter them.

Southern California Specific Challenges: Our hot, dry summers can stress Echinacea, making it more susceptible to pests and diseases. Santa Ana winds can also dry out the plants quickly, so be sure to provide adequate water during these periods. Winter-wet rainfall can also lead to fungal issues, so ensure good drainage and air circulation.

Good companion plants for Echinacea in Southern California include tomatoes and peppers. These vegetables enjoy similar growing conditions – full sun and well-drained soil. Plus, the taller tomato and pepper plants can provide some light shade for Echinacea during the hottest part of the day inland.

Herbs like rosemary and thyme are also excellent companions. They attract beneficial insects that can help control pests and their aromatic oils can deter unwanted critters. Avoid planting Echinacea near anything that needs constant watering. Echinacea thrives on neglect!