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How to Grow a Butterfly Bush

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

Planting, Growing, and Pruning Butterfly Bushes

Catherine Boeckmann
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The butterfly bush (Buddleia davidii) is a fast-growing shrub with masses of showy, fragrant flowers that attract pollinators. Planted in spring or fall before frost, this perennial will bloom from summer through autumn. Learn how to grow a butterfly bush (and learn if you should plant a butterfly bush).

About Butterfly Bushes

Also called “summer lilacs,” Buddleja 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.
Varieties

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 loves nature, stargazing, and gardening so it’s not surprising that she and The Old Farmer’s Almanac found each other. She leads digital content for the Almanac website, and is also a certified master gardener in the state of Indiana. Read More from Catherine Boeckmann
 

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Comments

In general, the butterfly bush is a Zone 5 and south kind of plant. It would be better to look for native plants that will thrive. You might find this database helpful: 
www.wildflower.org/plants/

KatieP (not verified)

9 years 10 months ago

Its May 24th and my buddleia bush has already bloomed and the blooms have gone brown (I live in the Los Angeles area). Should I cut it back now and will it bloom again in the summer if I do so? The plant is about 1.5 feet tall.

My blooms on my butterfly tree are dying as soon as they bloom. Otherwise the tree looks great. It is in a big pot. Not sure what's going on.

Christy Sanchez (not verified)

9 years 10 months ago

Hi, I have 2 beautiful butterfly bushes... they have each grown to almost 5 feet tall... just this morning I noticed wilted leaves and upon further investigation, one of the branches has broken off. It's about 3 feet tall with lots of beautiful purple flowers. Can I just make a clean cut at the bottom and stick it back in the soil. Or should I cut it at the bottom and then shorten the branch significantly and put it in a pot? I want to try to save it if at all possible. Please guide me. I read through the comments and see about a new cutting and putting it in rooting hormone but this stem broke off... can it be saved? Thank you!!

Janet Stacey (not verified)

9 years 8 months ago

I have a few buddleia cuttings & would like to know how to grow shrubs from them. Wirh thanks.

Hi Christy,
It's best to cut the branch off where the brake is. You can then propagate any softwood cuttings (new growth) from that branch. The big woody branch is not going to grow back.

Linda S Casey (not verified)

9 years 10 months ago

Black Walnut Trees, will the bush grow within the root zone of them?

Linda. I do not have any hands on experience with black walnut, but I took a tree science class in college and was told that the leaves of black walnut are high in acid or another toxin I don't exactly remember witch. But they tend to kill grass and other plant life including sprouting walnut trees when they decompose. So it would most likely help if you rake any leaves that fall from your Black Walnut tree and not use them in your compost if you are trying to grow anything underneath them

It is not the leaves of the black walnut that will cause you a problem. It is the root that kills other plants. The roots release a toxin in the soil to surrounding plants that will kill them. Few plants are immune to black walnut toxins. The only plants I know that are resistant are ginseng and black raspberries.The odd thing about black walnuts is depending on the weather and the rainfall determines the amount of toxins released by the roots. That is why plants will live next to a black walnut tree just fine one year and then die the next year. If you ever look at the ground around a black walnut tree you can tell where the major roots run. I have a garden near a walnut tree and you can draw a line through my garden to the tree. The plants will either be stunted or dead when the weather gets hot and dry. Plants a few feet away will be fine.