Woolly Butterfly Bush
Buddleja marrubiifolia
A woolly-leaved shrub from the Chihuahuan Desert that is a magnet for butterflies with its orange spring and summer blooms.
Hardy in USDA zones 9-11; evergreen in low-desert winters, root-hardy against occasional frost, and fully heat-adapted to Phoenix summers.
AMWUA Notes
A Chihuahuan shrub that keeps fuller foliage with regular irrigation while still being far thriftier than a non-desert butterfly bush.
Care Guide
Best with regular deep watering every 7-10 days in summer to keep the silvery woolly foliage full; avoid soggy soil, which it will not tolerate.
Tip-prune after the main bloom and lightly head back in late winter to maintain a rounded shape; avoid hard shearing, which spoils the soft mounded look.
A light spring feeding is sufficient; too much nitrogen reduces the felty leaf character.
Rarely bothered by pests; the woolly leaf surface discourages most feeding insects.
Evergreen in mild winters and root-hardy in colder ones, it carries round orange marble-like flower clusters from spring into midsummer that butterflies swarm.
Soil, Feeding & Propagation
Lean, rocky, well-drained desert soils; tolerates caliche and alkaline pH 7.5-8.5.
Needs sharp, fast-draining soil.
Low feeder.
From seed or semi-hardwood cuttings.
5 ft
Shallow, non-aggressive roots; safe near pools and paving.
Placement Tips
- •Give each plant a 5 ft space; its tidy rounded form suits foundation beds and low informal massing.
- •Its silver foliage contrasts beautifully with green or purple-leaved shrubs and orange bloom pops against dark walls.
- •Low litter and clean habit make it a good pool-area or patio shrub.
- •Place in full sun with good drainage; it sulks in shade or heavy clay.
Features
Best Uses
Ecological Value
Attracts
Wildlife Value
Companion Plants
Quick Stats
Design Styles
Include in Your Project
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Use this care guide to maintain your Woolly Butterfly Bush. Questions about your landscape? Reach out anytime.
Data from 2024 AMWUA “Landscape Plants for the Arizona Desert” guide.
Woolly Butterfly Bush — common questions
Answers for low-desert Phoenix conditions, drawn from this plant’s growing data.
How much water does Woolly Butterfly Bush need in Phoenix?
Woolly Butterfly Bush is a low-water shrub once established. Best with regular deep watering every 7-10 days in summer to keep the silvery woolly foliage full; avoid soggy soil, which it will not tolerate. A Chihuahuan shrub that keeps fuller foliage with regular irrigation while still being far thriftier than a non-desert butterfly bush.
How big does Woolly Butterfly Bush get?
Expect roughly 5 ft tall and 5 ft wide at maturity, with a moderate growth rate. Allow about 5 ft of spacing when planting. Shallow, non-aggressive roots; safe near pools and paving.
Can you plant Woolly Butterfly Bush near a pool?
Yes. Woolly Butterfly Bush is considered pool-friendly, meaning it stays clean enough around water features and hardscape. Litter is rated low.
Can Woolly Butterfly Bush handle Arizona heat and winter frost?
Woolly Butterfly Bush is hardy in USDA 9-11 and wants full sun. Hardy in USDA zones 9-11; evergreen in low-desert winters, root-hardy against occasional frost, and fully heat-adapted to Phoenix summers. Evergreen in mild winters and root-hardy in colder ones, it carries round orange marble-like flower clusters from spring into midsummer that butterflies swarm.
Does Woolly Butterfly Bush have thorns?
No. Woolly Butterfly Bush is thornless, so it is safe alongside walkways, patios and play areas.
Is Woolly Butterfly Bush safe around pets?
Woolly Butterfly Bush is listed as pet-friendly in this guide. If your dog is a determined chewer, check any new plant with your vet before planting.
When does Woolly Butterfly Bush bloom in Arizona?
Woolly Butterfly Bush blooms in spring-midsummer, with orange flowers. The bloom draws butterflies.
How much maintenance does Woolly Butterfly Bush need?
Woolly Butterfly Bush is low-maintenance. Leaf, flower and pod litter is rated low. Tip-prune after the main bloom and lightly head back in late winter to maintain a rounded shape; avoid hard shearing, which spoils the soft mounded look.
What kind of soil does Woolly Butterfly Bush need?
Lean, rocky, well-drained desert soils; tolerates caliche and alkaline pH 7.5-8.5. Nutrient needs are low. A light spring feeding is sufficient; too much nitrogen reduces the felty leaf character.
Is Woolly Butterfly Bush native to Arizona?
No. Woolly Butterfly Bush is not an Arizona native; it originates from the Chihuahuan Desert, but it is grown successfully in low-desert landscapes here.