Coneflowers are incredibly popular perennials and for good reason. They’re native to North America, support many species of pollinators and birds, and are long-flowering, pest-resistant, and drought-tolerant. Plus, the beautiful flowers come in a wide range of colors including purple, pink, red, white, orange, and yellow. Knowing when to cut back coneflowers is essential to triggering more blooms, controlling plant energy, and feeding and sheltering wildlife. In this article you’ll learn three options for when to prune coneflowers, how to do it right, and when to leave them alone.

Why you need to know when to cut back coneflowers

Coneflowers are ecological superstars thanks to their pollinator support and heavy seed production that feeds many species of birds over the winter. Letting their hollow stems stand in the garden over winter also provides winter shelter sites for native bees and other pollinators. Which brings me to pruning. Proper pruning means more flowers to support bees and butterflies in summer. And pruning at the wrong time can remove those valuable seed heads that benefit birds and the stems for winter safety. 

There are many species and cultivars of coneflowers you can plant. For pollinators, stick to single-flowering varieties, not the doubles whose nectar and pollen is blocked by the many layers of petals. My favorites include cultivars like Magnus, Cheyenne Spirit, and White Swan, as well as species like pale purple coneflower (Echinacea pallida) and yellow coneflower (Echinacea paradoxa).

When to cut back coneflowers: 3 easy options

Below you’ll discover three times to grab your pruners and cut back coneflowers to promote loads of flowers and healthier plants. However, pruning isn’t always necessary and you’ll also learn when it’s best to leave the plants alone. 

Option 1: Late winter or spring pruning

For gardeners wondering when to cut back coneflowers, spring is typically the best option. There are several reasons for this:

1. Leaving seed heads standing over the winter provides interest to the garden, even when it’s covered in frost and snow.
2. In late autumn those seed heads are packed with seeds, which birds, like goldfinches, happily feast on over the winter.
3. Coneflower stalks are hollow providing welcome overwintering shelter to bees, as well as other pollinators and beneficial insects. 
4. Not cutting back coneflowers in fall lets the stems catch and trap blowing snow. This insulates the crown of the plant, protecting it from frigid temperatures. 

Now that we know all the reasons for not cutting back the plants in fall, let’s look at how to cut back coneflowers in late winter or spring. For many gardeners, late winter is the best time to prune cornflowers. It’s true that cutting back the plants early in the season before the new green shoots emerge from the soil prevents damage to tender new growth. But cleaning up very early – before the overwintering insects have woken up – can impact the beneficial insect population in your garden.

If possible, wait to cut back coneflowers until the temperatures are over 50 degrees F (10 degrees C) for at least 7 days. That gives insects time to emerge. If you must clean up earlier, place the stems carefully to the side of your yard or garden so they can come out when the time is right. Whatever time you prune coneflowers, use clean garden shears and cut the dead stems down to 2 inches above the ground. 

Option 2: Fall pruning

Traditionally, gardeners would cut back perennials, like coneflowers, in autumn to tidy up the garden before winter. However, we now know that leaving the dead stems and seed heads in the garden in autumn provides food for birds and overwintering sites for pollinators. For these reasons, I don’t recommend cutting back coneflowers in fall. 

The exception to this is if your coneflower plants are afflicted with a disease like powdery mildew, which typically shows up in late summer or early autumn. Powdery mildew is easy to spot as the leaves look like they’ve been coated with a grey powder. It starts out as individual spots or blotches, but soon spreads over the leaf surface. In serious cases, powdery mildew also affects the stems and flower buds. This reduces flowering and weakens the plant. 

Cut back affected stems and foliage in autumn, placing the debris in the trash, not your compost bin. And consider the site. Does it offer enough sun? Plant struggling in shade are more prone to developing powdery mildew. As are overcrowded plants. Dig up and divide coneflowers if they’re spaced too close together and replant, placing them at least 18 inches apart. Early spring is a great time to divide coneflowers. I use a spade to dig up the clump and a garden knife to separate it into sections for replanting. 

Option 3: Summer deadheading

The final option for when to cut back coneflowers is all about deadheading. Deadheading is removing spent flowers as they fade. Doing this weekly in summer prompts a heavier show of blooms by forcing new buds to form. You may also want to pick coneflowers for bouquets. The pretty blooms make very long-lasting arrangements. If so, follow the same directions for deadheading, just clip the blooms when they’re opening or still in their prime. 

To deadhead coneflowers, use clean pruners or garden snips to clip off flowers as soon they fade, cutting back to a new flower bud or side shoot. Clip at an angle above the new growth, leaving a quarter inch stub. Stop deadheading in early September so the current flowers have time to mature their seed-bearing central cones. The birds will thank you!

Pro pruning tip: Prevent the spread of disease by wiping the blades with 70% isopropyl alcohol as you move from plant to plant.

Can you Chelsea chop coneflowers?

Yes! But this popular pruning technique is best practiced on tall-growing types of coneflowers like cutleaf coneflower. If done on dwarf varieties, their height will be very compact. A Chelsea chop controls growth on perennials that grow tall and are prone to flopping. It reduces their mature size, but it also impacts blooming and if done right, can extend the flowering season. For example, when you cut back half of the stems, the untrimmed ones flower first, followed by a late show of flowers from the trimmed stems. 

To Chelsea chop tall coneflower species and cultivars, grab your pruners or hedge shears in late spring. The plant should be actively growing, but not yet have any flower buds. I usually do this in late May. Cut the plant, or a portion of the plant, back by one-third to one-half. That’s it! This easy pruning technique works on many types of mid to late summer flowering perennials. 

More tips on growing coneflowers

Gardeners love coneflowers because they’re such hands-off plants. That said, there are a few things you can do to encourage healthy growth and heavy flowering. 

• Plant in full sun. Coneflowers perform and flower best when they’re grown in a site that offers full sun and average well-draining soil. 
• Apply compost in the spring or fall. I top dress around the plants – not on top – with an inch of compost in spring or autumn. 
• Water only in severe drought. Coneflowers are tolerant of dry growing conditions, but in times of severe drought give the plants a deep watering every two weeks. 

Now that we know more about when to cut back coneflowers, here are more expert articles on growing perennials:

• 10 of the longest flowering perennials
• How to grow coneflowers from seed
• Purple Dome aster: A fall-bloomer for your garden
• The best drought-tolerant perennials