Echinacea in Zone 6B — Southeast

Echinacea, or coneflower, is a fantastic addition to any Zone 6B garden here in the Southeast. Not only do the vibrant blooms add beauty to your flower beds, but they also attract pollinators and beneficial insects. Plus, you can harvest the petals and roots for teas and tinctures – perfect for those "under the weather" days that sometimes come with our rapidly changing spring and fall weather.

Our hot and humid summers can present some challenges when it comes to disease pressure, but with a little planning and proper timing, Echinacea is very manageable. With our long 208-day growing season, you have plenty of time to get these beauties established and thriving.

Starting Echinacea indoors is an option, but honestly, you might find it easier to direct sow or buy established plants from your local nursery. However, if you want to get a jump start, you can start seeds indoors from early to late February, 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. Be sure to keep the soil consistently moist, but not soggy. Bottom watering is a great way to keep the soil evenly moist without disturbing the delicate seedlings. Starting seeds indoors is a moderate start to the season and allows you to get a head start on transplanting.

Transplanting Echinacea outdoors should be done from early to late April, after the last expected frost. Before you move them outside, be sure to harden off your seedlings by gradually exposing them to outdoor conditions for about a week.

Space your plants 18-24 inches apart to allow for good air circulation – this is especially important in our humid climate to prevent fungal diseases. While transplanting is a viable option, keep in mind that Echinacea seeds need cold stratification, so buying established plants from a local nursery is often the easiest way to get them going.

Direct sowing Echinacea is a perfectly acceptable method, and it can save you some effort. Sow seeds from early April through mid July, once the soil has warmed up a bit.

Prepare the soil by loosening it and removing any weeds. Echinacea isn't picky, but well-draining soil is always a plus. Sprinkle the seeds on the surface and lightly cover them with soil. Keep the soil consistently moist until the seedlings emerge, usually in a week or two. Thin the seedlings to 18-24 inches apart once they're a few inches tall.

Echinacea is wonderfully drought-tolerant once it's established, making it a low-maintenance choice for our Southeast gardens. These plants thrive in poor, dry soil, so don't be tempted to overwater them.

During the spring, when the plants are getting established, water them deeply once a week if we aren't getting regular rainfall. Stick your finger about two inches into the soil – if it feels dry, it's time to water. Aim for about an inch of water per week.

Once the summer heat hits, especially during those stretches when the afternoon thunderstorms skip your yard, check the soil moisture more frequently. Even though they're drought-tolerant, young plants will still need supplemental watering if the soil dries out completely. Water at the base of the plant to avoid wetting the foliage, which can encourage fungal diseases in our humid climate. Signs of underwatering include wilting leaves and dry, brittle stems. Overwatering can lead to root rot, so watch out for yellowing leaves and a mushy base. A good layer of mulch around the base of the plants will help retain moisture and suppress weeds. Pine straw or shredded hardwood mulch work well here in the Southeast.

Pruning Echinacea is pretty straightforward. Deadheading spent flowers will encourage more blooms throughout the season, so snip off the faded flower heads just below the bloom.

However, if you want to leave the seed heads for the birds (goldfinches love them!) and add some winter interest to your garden, that's perfectly fine too. In late winter, before new growth appears, cut back the entire plant to the ground to tidy things up and make way for fresh growth in the spring.

You can expect your first Echinacea harvest from early July through early November, about 90 days after planting. The flowers will be in full bloom by midsummer, and they'll continue to produce throughout the fall.

Harvest the petals when the flowers are fully open and the colors are vibrant. Simply snip off the petals near the base of the flower head. You can use them fresh or dry them for tea. Leaving some seed heads on the plants will attract goldfinches, adding even more beauty to your garden. As the first frost approaches in late October, you can harvest any remaining flowers and seed heads to dry for later use.

Echinacea is generally a tough plant, but here in the Southeast, we do have a few common problems to watch out for: aster yellows, powdery mildew, and Japanese beetles.

Aster Yellows

• What it looks like: Distorted, greenish flowers and stunted growth. The plant may also develop abnormal clusters of leaves.
• What causes it: A disease spread by leafhoppers. It's more prevalent during warm, dry periods, but can still affect plants in our humid environment.
• How to fix/prevent it: Unfortunately, there's no cure for aster yellows. Remove and destroy infected plants 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 heads. Leaves may curl, yellow, and eventually die.
• What causes it: Various fungi that thrive in warm days, cool nights, and moderate humidity. Dry leaf surfaces actually favor it (unlike most fungi). Our hot and humid summers create ideal conditions.
• How to fix/prevent it: Improve air circulation by spacing plants properly and pruning out crowded growth. Remove and destroy 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 if possible.

Japanese Beetles

• What it looks like: Skeletonized leaves – they eat the tissue between the veins, leaving a lace-like appearance. You'll see metallic green beetles congregating on the plants.
• What causes it: These beetles are voracious eaters and are particularly active during our hot summers.
• How to fix/prevent it: Handpick the beetles off the plants in the early morning and drop them into a bucket of soapy water. Neem oil can also deter them. You can also use Japanese beetle traps, but be aware that they can attract more beetles to your yard.

Southeast Specific Challenges: Our hot and humid summers, combined with our wet-summer rainfall, create the perfect environment for fungal diseases like powdery mildew. Good air circulation and proper watering techniques are essential for keeping your Echinacea healthy. Also, be vigilant about Japanese beetles, as they can quickly decimate your plants.

Echinacea makes a great companion plant for several vegetables and herbs in your Southeast garden. Tomatoes and peppers benefit from Echinacea's ability to attract pollinators, leading to better fruit set.

Herbs like basil and rosemary can help deter pests that might otherwise bother your Echinacea. Avoid planting Echinacea near anything that prefers very rich, moist soil, as Echinacea prefers drier conditions.