Fuki Japanese butterbur, ecologically grown seeds (Petasites japonicus)
Ecologically grown
Fuki Japanese butterbur, ecologically grown seeds (Petasites japonicus) This rhizomatous perennial in the Asteraceae family produces exceptionally large leaves and early shoots. Kew accepts Petasites japonicus and places its native range from China through Japan, Korea, the Kuril Islands, and Sakhalin. It is not native to Canada; VASCAN records it in British Columbia, Ontario, and Québec. The Gaia packet contains approximately 5 ecologically grown, open-pollinated heirloom seeds. Gaia also labels the plant invasive, an important consideration before choosing a planting site. Its broad foliage dies back in winter before returning from underground rhizomes.
Cold-stratify seeds for 4 weeks, then sow approximately 1/8 inch deep. Winter sowing in autumn is another option. After stratification, maintain 15 to 21°C, preferably near 18°C; emergence is listed at 14 to 21 days. Move plants to shade or partial shade in rich soil that remains moist. Allow 36 to 48 inches between plants and 48 to 60 inches between rows. Mature plants may reach 4 to 6 feet high and 3 to 5 feet wide. Gaia lists approximately 90 days and a minimum temperature of -18°C.
Japanese butterbur spreads vigorously through rhizomes and can form a colony that is difficult to remove. Grow it only in a completely contained site away from waterways, ditches, natural areas, and property boundaries. Remove flower heads before seed develops and never place living rhizomes in compost. Young petioles and shoots have traditional culinary uses in Japan, but the plant naturally contains pyrrolizidine alkaloids. Never eat it raw or use it as a homemade tea or remedy. Rigorous traditional preparation reduces these compounds but does not guarantee their complete removal. Containment is essential.
Practical guide
How to use it
Good to know