How to Grow Dwarf Butterfly Bush

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Dwarf Butterfly Bush

Buddleja davidii 'Nanho'

shrub

A compact cultivar of butterfly bush that typically reaches 3-5 feet tall, making it ideal for smaller gardens and containers. This deciduous to semi-evergreen shrub produces fragrant, tubular flower spikes in shades of purple, blue, pink, or white that attract butterflies and pollinators throughout summer and fall. Despite being smaller than standard butterfly bush, it maintains the same vigorous, easy-growing nature and extended blooming period.

Looking for a specific variety?

Nanho Blue Nanho Purple Nanho White Nanho Pink Petite Plum Petite Snow

When should you plant Dwarf Butterfly Bush in your zone?

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Example Dwarf Butterfly Bush timeline · Pittsburgh, PA (Zone 6b)

Plant Dwarf Butterfly Bush
Around Apr 17

Near Pittsburgh's average last spring frost.
Tend & protect
Late spring–summer

Watering, feeding, and pest-watch reminders.
Harvest Dwarf Butterfly Bush
Late summer into fall

Before the first fall frost (≈ Nov 8)

Sample dates for Pittsburgh, PA. Sign up to get exact Dwarf Butterfly Bush dates for your own zip code.

Growing Conditions

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Sun: Full sun, 6-8 hours daily; tolerates partial shade but flowering reduces

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Water: Moderate watering; water deeply 1-2 times weekly during growing season. Once established, fairly drought-tolerant. Reduce watering in winter. Avoid waterlogging.

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Spacing: 36-48 inches

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Days to maturity: Flowers appear 60-90 days after planting; reaches mature size in 2-3 years

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Planting depth: Transplants: plant at same depth as container; seeds: surface sow or barely cover (light germinators)

Soil

Type: Well-draining loamy or sandy soil

pH: 6.0-7.5

Amendments:

Compost or well-rotted organic matter at planting Perlite or coarse sand for heavy clay soils Mulch (2-3 inches) to retain moisture and suppress weeds

Growing Zones

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Thrives in zones 5b-10a; most vigorous in zones 6-9

5b 6a 6b 7a 7b 8a 8b 9a 9b 10a

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Growth Stages

Establishment

4-6 weeks

Young transplant developing root system and initial leafy growth; no flowers yet

Water regularly to establish roots. Protect from harsh winds. Mulch around base. Keep soil consistently moist but not soggy.

Vegetative Growth

6-8 weeks

Rapid leaf and stem development; plant fills out with lance-shaped, gray-green foliage

Apply balanced fertilizer monthly. Remove dead or damaged branches. Pinch growing tips to encourage bushiness if desired.

Pre-flowering

2-3 weeks

Flower buds form at branch tips; plant reaches near-full height and width

Reduce nitrogen, apply phosphorus-rich fertilizer to promote blooming. Continue regular watering. Remove any crossing or weak branches.

Flowering & Fruiting

8-12 weeks (summer through fall)

Dense spikes of fragrant tubular flowers appear; flowers transition to seed pods if not deadheaded

Deadhead spent flower spikes to encourage continuous blooming. Water during dry spells. Attract butterflies and pollinators. Minimal fertilizer needed.

Dormancy & Pruning

2-4 months (winter)

Foliage may drop in colder zones; stems bare or with sparse leaves; seed pods visible

In spring (early March before growth), cut back to 12-24 inches to rejuvenate. Remove dead wood. Optional: prune lightly throughout winter to shape.

Companion Planting

Plan your garden →

Plant with:

Lavender Coreopsis Black-eyed Susan Russian Sage Catmint Yarrow Salvia Echinacea Sedums Ornamental grasses

Avoid planting near:

Sensitive native plants (butterfly bush is considered invasive in some regions) Plants requiring consistently moist soil Tender perennials in cold zones (compete for nutrients and water)

Common Pests

Spray with water to dislodge; use neem oil or insecticidal soap if severe. Increase humidity around plant.
Yellow sticky traps; insecticidal soap or neem oil. Remove heavily infested leaves.
Hand-pick early morning or use pheromone traps at distance. Neem oil for heavy infestations.
Ensure good air circulation; avoid overhead watering. Spray with sulfur or potassium bicarbonate fungicide if needed.
Improve drainage; reduce watering frequency. Remove affected plant material; replant in fresh, well-draining soil if severely affected.

Uses

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Butterfly & Pollinator Magnet

Wildlife

The abundant nectar-rich flower spikes attract butterflies, bees, hummingbirds, and other pollinators throughout summer and fall. Its extended blooming period makes it invaluable for supporting pollinator populations when other nectar sources are scarce. [source]

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Cut Flowers & Arrangements

Household

The fragrant flower spikes last well in water and make excellent additions to fresh flower arrangements. Cut spikes when flowers are opening for longest vase life (7-10 days). [source]

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Ornamental Landscaping

Household

The compact size, extended bloom period, and variety of flower colors make dwarf butterfly bush ideal for borders, mixed plantings, containers, and small gardens where standard butterfly bush would overwhelm the space. [source]

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Traditional Chinese Medicine

Medicinal

Buddleja species have been used in traditional Chinese medicine for various purposes, though scientific evidence is limited. The plant contains alkaloids and other compounds that have been studied for potential health properties. [source]

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Dried Flowers & Crafts

Craft

Flower spikes can be dried for long-lasting arrangements, wreaths, and craft projects. Hang bundles upside down in a warm, dry location for 2-3 weeks until completely dry. [source]

This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.

Harvest Tips

Not typically harvested for food or medicine. Deadhead spent flower spikes regularly (pinch or cut just below the flower cluster) to promote continuous blooming throughout the season. Collect mature seed pods in fall if desired for propagation or composting. For ornamental use, cut fresh flowers for arrangements as they open.

Fun Facts

🌱 The common name 'butterfly bush' comes from its remarkable ability to attract butterflies; a single mature plant can attract dozens of butterflies and other pollinators on a sunny day.
🌱 Despite its small size, dwarf butterfly bush can produce thousands of seeds that spread via wind; many regions classify it as an invasive species, so deadheading or removing seed pods is recommended.
🌱 Buddleja davidii is native to China and Tibet, where it grows on rocky slopes and disturbed areas; the 'Nanho' cultivar series was developed in Japan and represents some of the most compact and manageable selections available.

Gardening Terms

New to gardening? Learn about terms used in this guide:

Compost Cultivar Deadhead Full Sun Mulch Partial Shade pH Transplant

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