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Hardy perennial
Asteraceae
Perennials
Pétasite japonicus var. giganteus
Petasites japonicus
*Petasites japonicus* var. *giganteus*: 180 cm tall and 120 cm spread, sun to shade. White, cream flowers in May-June. Zone 4; choose soil compatible with its moisture needs.
- Exposure
- Sun to shade
- Life cycle
- Hardy perennial
- Hardiness
- Zone 4
Discover the plant
Common namePétasite japonicus var. giganteus
FamilyAsteraceae
GenusButterburs
Speciesjaponicus
TypeHardy perennial
Botanical namePetasites japonicus
The silhouette of Petasites japonicus var. giganteus (Petasites japonicus) adds depth to garden compositions. The foliage offers shades of green, which can be highlighted among different textures. The usual flowering period is May-June. When mature, expect 180 cm in height and 120 cm in width, which suggests its use at the back of borders and as a focal point.
In terms of cultivation, Petasites japonicus var. giganteus prefers full sun to shade exposure; the recommended soil is kept moist, Clay. For Petasites japonicus var. giganteus, regularly check the soil around the root ball: it should remain fresh. Water at the base when the surface begins to dry and adjust water supply according to rainfall; this exposure (full sun to shade) does not eliminate water needs. A spacing of approximately 120 cm between centers is a starting point, to be adjusted according to observed vigor. The indicated hardiness level is zone 4, to be assessed according to your garden conditions.
Maintenance of Petasites japonicus var. giganteus relies mainly on observing the clump: control shoots that extend beyond the intended location and maintain regular moisture under the large foliage. Petasites spreads vigorously by its rhizomes; reserve a delimited space for it, away from small delicate perennials. For pairings, consider perennial geraniums, campanulas, daylilies in varieties with similar needs. By composing around its volume of 180 cm by 120 cm, you will preserve the visibility of its flowering (May-June) and circulation between plants.
Planting guide
From planting to establishment.
Spacing / density
120 cm
Best planting time
Spring after the thaw or early autumn, allowing the roots to settle before the severe cold.
Growing method
Giant Butterbur (Petasites japonicus var. giganteus): Spring after the thaw or early autumn, allowing the roots time to establish before the severe cold. For Giant Butterbur, regularly check the soil around the root ball: it must remain moist. Water at the base when the surface begins to dry and adjust watering according to rainfall; its exposure (sun to shade) does not eliminate water requirements. Butterbur spreads vigorously through its rhizomes; dedicate a confined space to it, away from small, fragile perennials.
Soil and care
The right care,at the right time.
Care level
Regular maintenance
Watering
For Japanese butterbur (Petasites japonicus var. giganteus), regularly check the soil around the root ball: it should remain moist. Water at the base when the surface begins to dry out, and adjust the amount of water according to rainfall; this exposure (sun to shade) does not eliminate its water requirements.
Soil type
Kept moist, Clayey
Fertilization
Fertilizer for flowering
Moisture
Regular watering during growth
Seasonal care
Giant butterbur: control any new growth that extends beyond the desired area and maintain consistent moisture beneath the large foliage. During its flowering period (May-June), also check for damaged stems and neighboring plants that might obscure the clump.
Container growing
A garden,within reach.
Recommended pot size
A stable container with drainage holes, noticeably wider than the root ball; size to be adapted to the format sold and to the adult development.
Open ground generally offers more space for *Petasites japonicus* var. *giganteus*. A container trial requires sufficient root volume, functional drainage, and regular moisture monitoring. The commercial format and overwintering will need to be adapted to the chosen pot.
Bloom and dimensions
Its place,in your garden.
Mature height
6 feet (1.83 m)
Width / spread
4 feet (1.22 m)
Flower color
YELLOW
Foliage color
Green
Foliage type
Not hardy in cold climates
Growth rate
Moderate
Growth habit
Spread
Fragrance
Not documented for this selection
Bloom period
May-June
Garden associations
In goodcompany.
Companion plants
Suggested companion plants for *Petasites japonicus* var. *giganteus*: perennial geraniums, campanulas, daylilies. Choose varieties that tolerate sun to shade and comparable moisture levels; allow each clump its adult space.
Plants to avoid
Around Pétasite japonicus var. giganteus, especially avoid neighboring plants that would cover its leaves or strongly compete with its root ball. Compatibility in terms of light, water, and size takes precedence over a list of so-called enemy plants.
Frequently asked questions
Your questions,answered.
Where to plant Petasites japonicus var. giganteus?
Provide sun to shade and suitable soil (kept moist, clayey). Butterbur spreads vigorously by its rhizomes; reserve a delimited space for it away from small, fragile perennials.
Where should I plant Petasites japonicus var. giganteus?
Expect a height of around 180 cm and a width of 120 cm at maturity. Approximately 120 cm between centers, to be adjusted according to the actual development of the clump. This size is suitable for use at the back of a flower bed and as a focal point.
When does *Petasites japonicus* var. *giganteus* bloom?
The period indicated is May-June. The flower color palette is white, cream. The exact date and duration depend on the climate, season, and plant establishment.
How to water and care for *Petasites japonicus* var. *giganteus*?
For *Petasites japonicus* var. *giganteus*, regularly check the soil around the root ball: it must remain moist. Water at the base when the surface begins to dry and adjust waterings according to rainfall; this exposure (sun to shade) does not eliminate the need for water. Control any new shoots that grow beyond the intended location and maintain consistent humidity under the large foliage.
Can *Petasites japonicus* var. *giganteus* be grown in a pot?
Open ground generally offers more space for *Petasites japonicus var. giganteus*. A trial in a container requires sufficient volume for the roots, functional drainage, and regular moisture monitoring. The commercial size and overwintering will need to be adapted to the chosen pot.
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