Petasites japonicus
TAXONOMY
FamilyAsteraceae
GenusPetasites
Zone5
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Plants of the World OnlineABOUT
Petasites japonicus, commonly known as Japanese butterbur, is a perennial plant in the Asteraceae family. It is native to East Asia and thrives in temperate climates. This rhizomatous geophyte is known for its large, broad leaves and is often found in moist, shaded areas. The plant undergoes a dormancy period during the winter months.
ALSO KNOWN AS
Japanese Butterbur
Nardosmia japonica
Nardosmia japonica subsp. japonica
Petasites albus
Petasites japonicus var. japonicus
Tussilago petasites
OVERVIEW
VPDCalculate
WaterVery Wet
SoilLoamy
LightIndirect Bright (6 Hours)
Temperature15° C
Humidity70%
Dormancy3 Months
pH6.5
Pressure1,013 mbar
DETAILS
Care Instructions
Japanese butterbur prefers indirect bright light and thrives in moderate temperatures. It requires high humidity and consistently moist soil. Regular watering is essential to keep the soil from drying out. The plant can tolerate cooler temperatures but should be protected from frost.Soil
Petasites japonicus prefers loamy soil that is rich in organic matter. The soil should be well-draining yet consistently moist. Adding compost or other organic material can help improve soil structure and nutrient content.Fertilizer
A balanced fertilizer with an N-P-K ratio of 10-10-10 is suitable for Japanese butterbur. Fertilize the plant during the growing season to support its vigorous growth. Avoid over-fertilizing, as this can lead to excessive foliage growth at the expense of flowers.Repotting
Repotting is necessary when the plant outgrows its container or when the soil becomes depleted. The best time to repot is in early spring before new growth begins. Carefully divide the rhizomes and replant them in fresh, nutrient-rich soil.Propagation
Japanese butterbur can be propagated by division. The best time to propagate is in early spring or late autumn. Dig up the plant and carefully separate the rhizomes, ensuring each division has a healthy root system. Replant the divisions in suitable soil and water thoroughly.Pruning
Pruning is required to maintain the plant's shape and remove any dead or damaged foliage. The best time to prune is in late winter or early spring before new growth starts. Cut back the old stems to ground level to encourage fresh growth.Toxicity
Petasites japonicus is toxic to pets and humans if ingested. The plant contains pyrrolizidine alkaloids, which can cause liver damage. All parts of the plant are toxic, so it should be handled with care, especially around children and pets.Additional
Japanese butterbur is known for its rapid growth and can become invasive if not managed properly. Regular monitoring and maintenance are essential to prevent it from spreading uncontrollably. It is also used in traditional medicine for its anti-inflammatory properties.REVOLUTIONIZE YOUR PLANT CARE
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