Species

Cephalanthus occidentalisButtonbush

3 other cultivars

shrubN. America Native

Buttonbush

Cephalanthus occidentalis 'Sputnik'

The Story

Plant Bio

Cephalanthus occidentalis is a deciduous, multi-stemmed North American shrub that thrives in wet soils, riverbanks, and boggy ground. It produces distinct spherical flower heads composed of tiny tubular blossoms with long projecting styles that bloom through midsummer.

'Sputnik' is selected for its shell-pink to pinkish-white floral globes that resemble small satellites held above glossy green leaves. The musky-sweet flowers attract a wide array of butterflies, bees, and hummingbirds, followed by seed heads that feed winter waterfowl.

Uses & Benefits:

Offers unusual spherical pinkish-white flower heads that resemble small satellites, followed by persistent winter seed balls.

Stabilizes wet soils, stream banks, and rain garden slopes against water erosion.

Provides vital nectar for native bees, butterflies, and hummingbirds while offering nesting cover and winter seeds for waterfowl.

SpeciesCephalanthus occidentalisButtonbush

Essentials

At a Glance

Plant Type

Shrub

Height

144"

Width

144"

Light

Full Sun, Partial Sun

Zones

4, 5, 6, 7, 8, 9, 10

Water

High

Humidity

High

Lifespan

Perennial

Native To

North America

Toxicity

Toxic if ingested

Bloom period

Summer – Late summer

In flower about 3 months of the year

Planting

How to Grow

Select a planting site in full sun or light shade that receives abundant moisture, standing water, or runoff.
Dig a hole twice as wide as the root ball and set the plant so the crown sits level with or slightly below the surrounding soil line.
Backfill with native soil enriched with organic matter, firming gently around the root system.
Water thoroughly at planting and ensure the soil remains consistently moist to saturated throughout the growing season.

Pro Tip

Plant directly into standing water, rain garden basins, or rich boggy soils; standard dry garden borders cause severe drought stress and premature foliage drop.

Keep It Thriving

Care Guide

Do

Keep soil continuously wet or saturated, especially during hot summer periods.
Prune back hard every few winters if you wish to maintain a compact, rejuvenated form.
Plant in full sun to maximize flower production and dense branching.

Don't

Do not allow soil to dry out completely, as drought damages foliage and stunts growth.
Do not cut back into old, leafless wood that lacks visible vegetative buds.
Do not plant in dry hillside borders or unwatered containers.

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Fertilize
Mulch
Pest Check
Prune

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Rain gardens and retention basinsPond margins and bog gardensStream bank erosion controlNative wildlife and pollinator gardens

Companion Plants

Clethra alnifolia Iris versicolor Lobelia cardinalis Cornus sericea

Multiply

Propagation Methods

Good to Know

Common Questions

Buttonbush questions

What zones can Buttonbush grow in?

Buttonbush is hardy in USDA Zones 4–10. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Buttonbush deer resistant?

Yes — Buttonbush is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.

When does Buttonbush bloom?

Buttonbush typically blooms in summer through late summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Buttonbush need full sun?

Buttonbush does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.