plant

Fuki butterbur

Petasites japonicus

Updated 8 Jul 2026 · AI-parsed entry

Fuki butterbur (Petasites japonicus) — a plant, for Part shade, High water.

What it needs & gives back

↓ Needs

Sunlightpart_shade to shade
Waterconsistently moist to wet

↑ Gives back

Biomassmedium to high
Shadedense ground cover

Through the year

Emergence

Emergence of new shoots in early spring after the last frost and when soil temperatures rise above 50C.

Flowering

Flowering occurs shortly after emergence, typically in early to mid-spring.

Fruiting

Fruiting follows flowering, with seeds maturing by late spring to early summer.

Senescence

Foliage begins to die back with the first autumn frosts.

Dormancy

Enters dormancy after senescence, remaining dormant through winter.

Timing is relative to your local season (temperate Northern Hemisphere).

Soil interactions

Drainagepoor to moist
Nitrogen fixingNo
MycorrhizalNo
Accumulatespotassium, calcium
Soil textureloam, clay
Organic matterHigh
Compaction toleranceMedium

Propagation

Methodsseed, division, rhizome_cuttings
Difficulty2 / 5
Establishes in~1 yr
Self-seedingModerate
Divisionspring

Wildlife & pests

Can host pestsslugs, snails