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How to Grow Butterfly Bushes: Planting, Pruning & Pollinator Tips

Attract beautiful butterflies to your garden with a butterfly bush.

Photo Credit
Willowpix/Getty
Botanical Name
Buddleia davidii
Plant Type
Shrubs and Bushes
Sun Exposure
Full Sun
Soil pH
Varies
Bloom Time
Summer
Fall
Flower Color
Pink
Purple
Red
White
Yellow
Hardiness Zone
5
6
7
8
9
10
Special Features
Attracts Butterflies
Attracts Songbirds

Grow a Garden That Butterflies Can’t Resist—Just Don’t Forget to Deadhead!

Written By: Catherine Boeckmann Executive Digital Editor and Master Gardener

If you’ve ever dreamed of a garden buzzing with butterflies, the butterfly bush might seem like your perfect match. With its arching stems and cone-shaped clusters of fragrant blooms, this fast-growing shrub is a pollinator magnet that brings nonstop summer color. But before you plant, there’s more to consider—like when to prune (hint: not too early!) and whether your region may classify it as invasive. In this guide, we’ll help you plant, grow, prune, and responsibly care for Buddleja—so you can enjoy its beauty while being a smart steward of your garden.

About Butterfly Bushes

Also called “summer lilacs,” butterfly bushes (Buddleia davidii) are hardy to Zone 5 and remain evergreen from Zone 8 south. Growing 5 to 10 feet tall, this large, arching shrub produces an abundance of flowers—long, spiked trusses—in mainly purple and pink colors. The shrub grows well in perennial gardens or as a shrub border, and the flowers are good for cutting.

Don’t prune at the wrong time. Butterfly bush growth appears on new wood, so pruning should wait until the new wood is ready to grow in spring. Also, be patient with this shrub as it may not leaf out in the spring until after other perennials. 

butterfly on a butterfly bush

Invasive Concerns of Butterfly Bushes

Please note that the butterfly bush, originally imported from China, has been classified as an invasive species in many U.S. states as it’s known to crowd out native plants that are essential to wildlife. In warm climates, it can become a noxious weed and spread aggressively, while in cooler climates, it mostly stays contained if gardeners deadhead the flowers.

Note: The butterfly bush does provide adult butterflies with nectar similar to that of many flowers. However, it is not a “host plant” for butterfly larvae; if you want the butterflies to stay, be sure to add native host plants such as milkweed, aster, and dill. See plants that attract butterflies.  

If you would still like to put a butterfly bush in your garden, there are a few species of non-invasive butterfly bushes native to the southwestern United States. Also, there are newer varieties that stay compact and won’t take over your garden. See our native list of butterfly bushes below.

Please check with your local cooperative extension for more information.

Read Next

Planting

Choose a location with full sun and moist, well-drained soil. 

When to Plant

How to Plant

  • Loosen the soil from 12 to 15 inches deep and mix in a 2- to 4-inch layer of compost.
  • Dig a hole twice the diameter of the plant container.
  • When placing the plant in the hole, the top of the rootball should be level with the soil surface. Gently backfill the hole around the rootball. Firm the soil.
  • Water thoroughly.

Growing

Caring for Butterfly Bushes

  • Water freely when in growth and sparingly otherwise. In the summer, water if rainfall is less than 1 inch per week.
  • Avoid fertilizing butterfly bush; too much fertility promotes leaf growth over flower production.
  • Remove spent flower spikes to encourage new shoots and flower buds.  In addition, it is important to deadhead the flowers just as they start to wither so that this invasive plant doesn’t spread volunteer seeds. Deadheading of this invasive is now required in many states.
  • Each spring, apply a thin layer of compost, then 2 to 4 inches of mulch to retain moisture and control weeds.
  • In cold, Northern climates, spread mulch up to 6 inches deep around the trunk to nurture it through the winter.
  • Buddleias are very late to break dormancy, so don’t be in a hurry to assess winter damage.
  • The bush should bloom abundantly even in its first year. In warmer climates, the bushes will grow into trees and develop rugged trunks that peel; peeling is normal.
  • In the northern limit of their range, they behave as herbaceous perennials, dying back to the root in cold winters.

Pruning Butterfly Bushes

Butterfly bushes must be pruned vigorously, or their flowers will grow up so high that you can’t see and enjoy them!

  • Since butterfly bushes bloom on new wood, even if there is no die-back, cut them back to the ground early each spring. Yes, hack to the ground!
  • Also, prune out dead stems, cutting them close to the ground.
  • Even where winters are mild enough for the stems to survive, prune severely to stimulate abundant growth on which flowers are borne.

Types

We are no longer recommending new plantings of the butterfly bush, given its categorization as an invasive in most of North America. Instead, we recommend using plants that better support the native landscape and food web, given our declining pollinator population. See alternative plants that attract butterflies.

Native Alternatives to Butterfly Bushes

Here are a few great flowering alternatives that also serve as host plants for caterpillars:

See a list of host plants native to your area here: Native Plant Finder

Gardening Products

Pests/Diseases

  • Susceptible to capsid bugs, caterpillars, weevils, mullein moths, and spider mites.
  • Fungal leaf spots and die-backs can occur.
  • Butterfly bushes are one of many deer-resistant plants.

Shrubs and Trees
About The Author
Catherine Boeckmann

Catherine Boeckmann

Executive Digital Editor and Master Gardener

We’ll help you plant, grow, prune, and responsibly care for Buddleja—so you can enjoy its beauty while being a smart steward of your garden.
Read More from Catherine Boeckmann

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Comments

<span>Claire</span> Sat, 07/27/2013 - 09:55
Some of My purple butterfly bushes are coming back with white not purple flowers. I live in PA. Is there something wrong in the soil? Is there anything I can do to prevent the remaining purple bushes from going white?
<a title="View user profile." href="/author/editors">The Editors</a> Mon, 07/29/2013 - 18:06

Well, we just learned something: For the vividly colored butterfly bushes, plant in sun and in rich soil with a pH of 6.0 to 7.5. When planted in shade, butterfly flowers tend to be pale pastels or even white. We hope this helps you. Thanks for asking!

 

 <span>Difabio</span> Sat, 07/27/2013 - 08:08
I pruned my butterfly bushes in the late fall last year. they never grew this year. Did I kill them? I live in the Northeast.
<a title="View user profile." href="/author/editors">The Editors</a> Mon, 07/29/2013 - 17:59

It is possible, maybe likely by now, that you did kill them. Pruning before the plants become fully dorman in the fall can result in failure in the next season. Late winter or early spring pruning is recommended.

Sorry to have to tell you.

 <span>Sally Amundsen</span> Thu, 07/25/2013 - 17:36
I just had a butterfly bush planted a couple days ago. It was well watered and now it wilts daily until I give it more water. What gives? I live in north center Illinois. Thank you!
<a title="View user profile." href="/author/editors">The Editors</a> Fri, 07/26/2013 - 11:17

Keep watering. It takes a little time for the plant to get established to its new location.

 <span>Lynne Franks</span> Thu, 07/25/2013 - 11:41
I'm in central IL and have butterfly bushes at least 14 yrs old.They're in full sun along a concrete driveway, never watered or fertilized. Flower heads are always a disappointment b/c they start browning out will the end is still blooming. Look ratty, so I cut them back. They don't look luscious like your picture. Also, older leaves always turn yellow (have started already). Never notice any bugs. I pull them off and sometimes new leaves grow back. What am I doing wrong? Also...too big. I cut back to the about a foot in the spring but are too big. Is it ok to deadhead about a foot at a time as I remove the spent flowers? Thank you!
<a title="View user profile." href="/author/editors">The Editors</a> Fri, 07/26/2013 - 11:26

If you have a stretch of hot and dry weather you should water the bush. And it's OK to prune the branches in the summer when you deadhead the flowers.

 <span>Miche'</span> Fri, 07/19/2013 - 08:53
We planted a bush last year and failed to prune in spring. The bush never came back as of July. Will it bloom in spring 2014 if we prune correctly? Ot is completely dead?
<span>Ann M Sullivan</span> Wed, 07/17/2013 - 00:48
We purchased a home last August. One corner of the front of the house near the front door are 4 butterfly bushes. The bushes were maybe waist-high with many blooms. This year the bushes are as tall as we are. The size is not appropriate for the location. Is there any way to keep them a certain size?