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Shrub · Scrophulariaceae family

Butterfly bush

Buddleja davidii

Full sun in a garden 5 ft 10⅞ in–9 ft 10⅛ in × 3 ft 3⅜ in–6 ft 6¾ in Flowers June–September to −73 °F
Flower colors Click a color

In short a 10-second read

SunFull sun
in a garden after 10 years5 ft 10⅞ in–9 ft 10⅛ in
in the wild up to 13 ft 1½ in
spacing 5 ft 10⅞ in
FlowersJune–September
PlantingMarch–May
WinterNo winter protection

Where to plant and how much to water

Sun, soil and water.

It grows best in full sun, in average soil.

Sun

Sun6 hours or more
Part shade3–6 hours
Shadeunder 3 h

Soil

tolerates any pH
acidicneutralalkaline
averageclayloamysandy

Watering

regularly until establisheddrought tolerant once establishedless when it rains

Frost

−73 °F
no winter protectionleafless in winter

How much space it takes

Mature size.

The mature plant next to a person (69 in).

3 ft 3⅜ in6 ft 6¾ in9 ft 10⅛ in13 ft 1½ in5 ft 10⅞ in–13 ft 1½ inspread 3 ft 11¼ in–14 ft 9⅛ in
5 ft 10⅞ in–13 ft 1½ in× spread 3 ft 11¼ in–14 ft 9⅛ in

Plant 5 ft 10⅞ in apart.

Reaches maturity in about 5–10 years. The final size depends on the cultivar and the spot — we give the range from smallest to largest.

Calendar

Through the year.

Typical for a temperate climate (four seasons). The line shows the current month.

The year at a glance

Flowers: JanuaryFlowers: FebruaryFlowers: MarchFlowers: AprilFlowers: MayFlowers: JuneFlowers: JulyFlowers: AugustFlowers: SeptemberFlowers: OctoberFlowers: NovemberFlowers: DecemberPlanting: JanuaryPlanting: FebruaryPlanting: MarchPlanting: AprilPlanting: MayPlanting: JunePlanting: JulyPlanting: AugustPlanting: SeptemberPlanting: OctoberPlanting: NovemberPlanting: DecemberJanFebMarAprMayJunJulAugSepOctNovDec
FlowersPlanting
Now, in October: nothing to do — the next job is in March.
JanFebMarAprMayJunJulAugSepOctNovDec

Flowers

JanFebMarAprMayJunJulAugSepOctNovDec

June–September · purple

Planting

JanFebMarAprMayJunJulAugSepOctNovDec

container plant: March–May

Feeding

Nutrition.

Light
compost or mulch

Pests and diseases

Common problems and what to do.

The most common problems in Central Europe. Protection is listed from the gentlest option.

High riskMedium riskLow riskRisk for this plant according to the source · no label = no documented level
Honey fungus

Honey fungus

Armillaria
High riskdisease
More about this problem

What you will see

Rotting roots, white mycelium under the bark, black bootlaces (rhizomorphs) in the soil, sudden death; mushrooms in fall.

The source says: it is among the plants particularly susceptible to honey fungus.

When to look

Summer – fall

How to protect

  1. Prevention
    • Choose species that honey fungus rarely attacks (e.g. Vaccinium).
  2. By handA deep barrier (17¾ in) of rubber sheeting in the soil blocks the bootlaces; regular deep cultivation breaks them.
Honey fungusdisease · summer – fallHigh risk

What you will see

Rotting roots, white mycelium under the bark, black bootlaces (rhizomorphs) in the soil, sudden death; mushrooms in fall.

The source says: it is among the plants particularly susceptible to honey fungus.

When to look

Summer – fall

How to protect

  1. Prevention
    • Choose species that honey fungus rarely attacks (e.g. Vaccinium).
  2. By handA deep barrier (17¾ in) of rubber sheeting in the soil blocks the bootlaces; regular deep cultivation breaks them.
More about this problem

What you will see

Leaves are speckled and bronzing, with fine webbing on the underside.

The source says: spider mites are common on this plant.

How to protect

  1. Prevention
    • Reduce dust and water stress; do not use broad-spectrum insecticides, which cause mite outbreaks.
  2. By handA strong jet of water on the underside of leaves.
  3. Gentle sprayInsecticidal soap or oil, thoroughly on the undersides; only after mites are confirmed.
Spider mitespestMedium risk

What you will see

Leaves are speckled and bronzing, with fine webbing on the underside.

The source says: spider mites are common on this plant.

How to protect

  1. Prevention
    • Reduce dust and water stress; do not use broad-spectrum insecticides, which cause mite outbreaks.
  2. By handA strong jet of water on the underside of leaves.
  3. Gentle sprayInsecticidal soap or oil, thoroughly on the undersides; only after mites are confirmed.
More about this problem

What you will see

Clusters of tiny sap-sucking insects on young shoots, curled leaves, sticky honeydew and sooty mold.

When to look

Spring – summer

How to protect

  1. Prevention
    • Aphids are part of a healthy garden and food for predators; a healthy plant usually tolerates them.
  2. By handWipe or rinse off colonies and remove affected tips.
  3. BiologicalEncourage natural enemies (ladybirds, earwigs, birds).
Aphidspest · spring – summer

What you will see

Clusters of tiny sap-sucking insects on young shoots, curled leaves, sticky honeydew and sooty mold.

When to look

Spring – summer

How to protect

  1. Prevention
    • Aphids are part of a healthy garden and food for predators; a healthy plant usually tolerates them.
  2. By handWipe or rinse off colonies and remove affected tips.
  3. BiologicalEncourage natural enemies (ladybirds, earwigs, birds).
More about this problem

What you will see

Brown to black spots on leaves; leaves turn yellow early.

How to protect

  1. Prevention
    • Remove old leaves before they infect the new season.
    • Do not wet the leaves when watering; keep the plant unstressed.
  2. By hand after the first spots; in fallRemove affected leaves at once and destroy them; collect fallen leaves in fall.
Leaf spotsdisease

What you will see

Brown to black spots on leaves; leaves turn yellow early.

How to protect

  1. Prevention
    • Remove old leaves before they infect the new season.
    • Do not wet the leaves when watering; keep the plant unstressed.
  2. By hand after the first spots; in fallRemove affected leaves at once and destroy them; collect fallen leaves in fall.
More about this problem
Sources (7)

Frequently asked

Quick answers.

When does butterfly bush flower?

In June–September; the flowers are purple.

Does butterfly bush tolerate shade?

No, it needs full sun.

How much space does butterfly bush need?

At maturity 3 ft 11¼ in–14 ft 9⅛ in wide and 5 ft 10⅞ in–13 ft 1½ in tall; recommended spacing 5 ft 10⅞ in.

Aphids — what can you do?

Aphids are part of a healthy garden and food for predators; a healthy plant usually tolerates them. Wipe or rinse off colonies and remove affected tips.

Spider mites — what can you do?

Reduce dust and water stress; do not use broad-spectrum insecticides, which cause mite outbreaks. A strong jet of water on the underside of leaves.

Sources (9) Checked 23 October 2026

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