Award 34th Demidovian Prize (Petasites japonicus)

Photo: Joi ItoCC BY 2.0via Wikimedia Commonsresized / cropped

Award 34th Demidovian Prize Plant Care

Petasites japonicus (Siebold & Zucc.) Maxim.

Updated · Sources · How we source care data

With large, heart-shaped leaves that can reach up to 3 feet in diameter, this plant originates from Japan and Korea. Its impressive size and lush foliage make it a desirable addition to any collection, and its ability to thrive in damp, shady conditions only adds to its appeal for plant collectors.

🌱Herbs🌼Perennials🌻Annuals
Water

Every 3–5 days

Light

Partial shade to full shade

Temp

50–75°F

Humidity

60–80%

At a glance

How do you care for Award 34th Demidovian Prize?

Water Award 34th Demidovian Prize every 3–5 days, letting the top layer of soil dry out between waterings, and give it partial shade to full shade. It prefers temperatures of 50–75°F (10–24°C) and 60–80% humidity. Fertilize it every 6 months during the growing season. It is reported as toxic to pets, so keep it out of reach of pets.

Where Is the Award 34th Demidovian Prize Native To?

Native range46 countries

What Is the Award 34th Demidovian Prize?

Award 34th Demidovian Prize (Petasites japonicus) belongs to the Asteraceae family within the Petasites genus. Award 34th Demidovian Prize is native to China, Japan, Korea and Sakhalin and introduced in Europe and North America.

Award 34th Demidovian Prize displays a large spreading perennial growth habit, reaching up to 3 ft tall with a spread of approximately 5 ft. Award 34th Demidovian Prize produces large, showy pink or white flower clusters.

Leaf size: approximately 12 inches.

How Often Should You Water a Award 34th Demidovian Prize?

Petasites japonicus requires watering every 3–5 days. Allow the top layer of soil to dry between waterings to prevent root rot. Reduce watering frequency during winter when growth slows.

Watering Frequency

Every 3–5 days

Let soil partially dry between waterings

What Light Does the Award 34th Demidovian Prize Need?

Award 34th Demidovian Prize thrives in partial shade to full shade. The optimal light range is 100–500 lux. Avoid placing Award 34th Demidovian Prize in direct, harsh sunlight for extended periods, as this can scorch the foliage.

Light Requirement

Partial shade to full shade

100–500 lux

What Temperature and Humidity Does the Award 34th Demidovian Prize Prefer?

Petasites japonicus grows best at temperatures of 50–75°F. Award 34th Demidovian Prize prefers humidity levels of 60–80%. A pebble tray or humidifier helps maintain adequate moisture around the plant.

Temperature

50–75°F

Humidity

60–80%

What Soil Mix Works Best for a Award 34th Demidovian Prize?

Rich, moist soil with good drainage. Good drainage is essential for Award 34th Demidovian Prize to prevent waterlogging, which leads to root rot and fungal issues.

How Often Should You Fertilize a Award 34th Demidovian Prize?

Feed Award 34th Demidovian Prize every 6 months during the growing season (spring and summer) with a balanced fertilizer diluted to the strength on the label.

Pause feeding in autumn and winter, when growth slows, and never fertilize dry soil — water first.

Fertilizing

Every 6 months

During the growing season

The PlantoScan app can remind you when to water and when to fertilize each plant.

How Do You Repot a Award 34th Demidovian Prize?

Divide and repot every 2-3 years in early spring. Choose a pot one size larger than the current container, and ensure it has drainage holes to allow excess water to escape.

How Do You Propagate a Award 34th Demidovian Prize?

Award 34th Demidovian Prize can be propagated through division, rhizome cuttings. Similar propagation techniques also apply to white butterbur plant care, which shares the same genus.

Is the Award 34th Demidovian Prize Toxic to Pets and Children?

Toxic (caution)

Reported as toxic in our plant data. Not verified by the ASPCA.

Toxic to humans and pets if ingested

This is a general caution, not veterinary or medical advice. If your pet ate a plant, contact your vet or animal poison control.

See all plants toxic to cats and plants toxic to dogs.

What Pests and Diseases Affect the Award 34th Demidovian Prize?

Award 34th Demidovian Prize is susceptible to slugs, snails, powdery mildew. Inspect the foliage regularly, especially along leaf undersides and stems. Treat infestations promptly with insecticidal soap or neem oil to prevent spread.

Yellow leaves, brown tips or drooping? See common plant problems and how to fix them.

What USDA Hardiness Zone Does the Award 34th Demidovian Prize Need?

Award 34th Demidovian Prize grows outdoors in USDA Zone 5a – 9b. It survives winters down to planting zone 5a. Award 34th Demidovian Prize is native to China, Japan, Korea and Sakhalin and introduced in Europe and North America.

Hardiness Zone

Zone 5a – 9b

Keep exploring plants

Award 34th Demidovian Prize is one of many species covered in the complete plant care and identification guide, which groups plants by genus, attribute, and popularity.

It belongs to the Petasites genus — compare its care with other Petasites species on PlantoScan.

Petasites is part of the Asteraceae plant family — browse all Asteraceae genera and species.

Award 34th Demidovian Prize copes with lower light than most plants — browse the full list of low-light plants.

Related Plant Care Guides

Closely related plants with similar care requirements:

Sources

  • Scientific name & taxonomy: Petasites japonicus (Siebold & Zucc.) Maxim., family Asteraceae (first published in Award 34th Demidovian Prize 212. 1866) — World Flora Online record, IPNI name record.
  • Pet toxicity: Award 34th Demidovian Prize is reported as toxic to pets in our plant data (not verified by the ASPCA), so treat it with caution. Checked against the ASPCA plant list; any other toxicity note on this page comes from PlantoScan's plant database.
  • Photo: Joi Ito, CC BY 2.0, Wikimedia Commons — original.
  • Hardiness zone: USDA Zone 5a – 9b, estimated from the plant's typical growing conditions.
  • Care values(watering, light, temperature, humidity, soil, fertilizing): PlantoScan's plant database, filtered by automatic plausibility checks — values that fail them are hidden. How we source and check plant data.

Spotted a mistake? Email info@upvision.media with the page link — we check and correct reported errors.

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