Japanese Butterbur (Petasites japonicus) is a fast-growing perennial herb known for its very large, kidney-shaped leaves and early spring flowers. It thrives in moist, sh
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Sunlight
Prefers partial to full shade; direct hot sun can scorch leaves.
Watering
Requires consistently moist to wet soil; does not tolerate dry conditions.
Soil
Rich, consistently moist, well-drained, slightly acidic to neutral loam.
Temperature
Prefers cool to moderate temperatures, 10-25 °C.
Habitat
Outdoor
Fertilizer
Benefits from light feeding in spring or rich organic matter.
Prefers partial to full shade; direct hot sun can scorch leaves.
Requires consistently moist to wet soil; does not tolerate dry conditions.
Rich, consistently moist, well-drained, slightly acidic to neutral loam.
Prefers cool to moderate temperatures, 10-25 °C.
Outdoor
Benefits from light feeding in spring or rich organic matter.
Plant Type
Herb
Plant Category
Ornamental, Vegetable
Plant Place Type
Ground, Garden, Groundcover
Plant Environment
Outdoor
Lifespan
Perennials
Plant Height
0.3-1 m
Spread
0.6-1.5 m
Growth Rate
Fast
Dormancy
Winter
Leaf Color
Green
Leaf Type
Basal, large, kidney-shaped to rounded
Flower Size
0.5-1 cm
Optimal Sunlight Lux
12500
Weed Status
Yes
Toxic for humans
Yes
Rating: 6/5
Toxic for pets
Yes
Rating: 7/5
Edible
Yes
Contains pyrrolizidine alkaloids (PAs) which are hepatotoxic and carcinogenic. Raw plant parts are toxic. Traditional preparation (boiling, soaking) is used to reduce PA content, but complete removal is difficult and consumption should be cautious.
