Buddleia Growing Guide

Buddleja species, Buddleja davidii and Buddleja globosa

Crop Rotation Group

Miscellaneous ●

Soil

Fertile, well-drained soil.

Position

Full sun to part shade.

Frost tolerant

Butterfly bush is winter hardy only in moderate climates, with winter injury likely below −20°C (5°F). Plants often regrow from the roots following harsh winters.

Feeding

Mulch the root zone with rotted manure in late winter or early spring.

Spacing

Single Plants: 1.80m (5' 10") each way (minimum)
Rows: 1.80m (5' 10") with 1.80m (5' 10") row gap (minimum)

Sow and Plant

Butterfly bush is invasive in many climates, though reseeding varies with cultivar and climate. Many new varieties have been developed that produce very few seeds, and these vegetatively propagated varieties are the only ones permitted in some areas. Set out container-grown plants in spring, soon after the soil begins to warm. Stem cuttings taken from near the base of plants often root readily in spring. Only very dwarf butterfly bushes can be grown in containers.
Our Garden Planner can produce a personalized calendar of when to sow, plant and harvest for your area.

Notes

Native to Asia, butterfly bush has escaped cultivation on most continents and is listed as an invasive species in many areas. Look for seed sterile varieties when making new plantings. Bees, butterflies and hummingbirds enjoy the blossoms, produced from midsummer to autumns. Where winters are mild, plants tend to be evergreen. In areas where reseeding is likely, cut back plants regularly through the summer. Light pruning also encourages more late-season flowers. Wait until winter’s end to prune plants back to about 35cm (14 inches), which encourages bushy growth. Butterfly bush blooms on new wood.

Harvesting

Branches can be used in cut arrangements, though the fragrance is not pleasing to all noses.

Planting and Harvesting Calendar

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Pests which Affect Buddleia

Aphids (General)

Slug

Snail