GardenWizzPlant Care Card

Rosebay Willowherb

Epilobium angustifolium · Perennial

Hardiness
H7 Very hardy (to below −20°C)
Position
Full sun, Partial shade
Height × Spread
0.5–2 m × —
Soil
wide range of soils; damp, wild areas such as streamsides or marshy ground; well-drained; chalk; pH Acid, Alkaline, Neutral
Flowering
June–September
Toxicity
No toxicity recorded

The Gardening Year

J
F
M
A
M
J
J
A
S
O
N
D
🪴 Plant out
🌸 In flower

Watch out for

Slugs and snails: Use physical barriers like copper tape or organic pellets to protect emerging growth.

Powdery mildew: Improve air circulation and water at the base to keep foliage dry; remove affected parts.

Rust diseases: Remove infected leaves promptly and avoid overhead watering to reduce humidity.

Excessive self-seeding: Deadhead flowers before seed heads form or cut back plants after flowering.

Full guide: gardenwizz.com/plants/rosebay-willowherb © GardenWizz — UK gardening encyclopedia