Square-stalked Willowherb (Epilobium Tetragonum) is a perennial herb in the Onagraceae family with easy care difficulty. It requires moderate watering and full sun or partial shade light in USDA hardiness zones 5-9. This plant is safe for cats and dogs.

Epilobium tetragonum is a perennial herbaceous plant known for its distinctive square stems and pink flowers.

Square-stalked Willowherb

Square-stalked Willowherb

Epilobium Tetragonum

Epilobium tetragonum is a perennial herbaceous plant known for its distinctive square stems and pink flowers.

Quick Facts

Type
herb
Lifecycle
perennial
Care Difficulty
Easy
Water Needs
Moderate
Light
Full Sun, Partial Shade
Hardiness Zones
5-9

Safety

🐕
Pet Safe
👶
Child Safe
Non-Toxic

Growing Conditions

Soil Types:loamy, sandy, gravelly
Indoor:No
Outdoor:Yes
Garden Use:groundcover, pollinator attraction, erosion control

Care Calendar

Monthly care tasks for Square-stalked Willowherb

Jan
Prune
Feb
Fertilize
Mar
Repot
Apr
Water+
May
...
Jun
...
Jul
...
Aug
...
Sep
...
Oct
...
Nov
...
Dec
...

Expert Care Tips

Pro tips from botanists and plant experts

Watering Tip

Check soil moisture by inserting your finger 1 inch deep. Water only when the top layer feels dry to prevent overwatering.

Humidity Trick

Group plants together to create...

Growth Hack

Rotate your plant every...

Photo Gallery10+ photos

Square-stalked Willowherb
Square-stalked Willowherb detail

View leaf details, flowers, seeds & more in the app

Taxonomy

Family:Onagraceae
Genus:Epilobium