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Real photographs from naturalists and photographers worldwide, each used under its own license. Credit: Photo by Sandy Wolkenberg / iNaturalist (CC BY), Photo by Timur Kalininsky / iNaturalist (CC BY) and Photo by Timur Kalininsky / iNaturalist (CC BY). How photos are sourced →
Japanese Painted Fern
Athyrium niponicum
Japanese Painted Fern is grown for its foliage rather than flowers, giving the garden structure and color all season long.
Months here are Northern Hemisphere months; in the Southern Hemisphere, shift them by six months.
Growing Japanese Painted Fern
Plant it in part shade. It prefers moderate water. It is hardy in USDA zones 4–9. Expect it to reach about 20 in tall and 20 in wide at maturity, in roughly 3 years (a house reading).
Pets
- No toxic listing found for dogs and cats in the sources we check.
Lists differ and none is complete. If a pet eats a plant and seems unwell, call a veterinarian or a pet poison helpline.
What was checked
Nine facts were checked against named botanical sources, each recorded beside the sources that carried it: mature height and spread, hardiness zones, sun, water, bloom months and color, the trait tags, and years to mature size, which rests on a recorded house rule where no publisher states one and is marked so. Soil, diseases, pests, toxicity and the plant's own names have not yet been read for this plant, and its trait tags are the ones a feature uses rather than every word a page prints. Each fact above carries its own mark. The planting, spacing and size sections are derived from these checked facts by a fixed rule, not checked separately, and the plant type is the library's own classification.
When to plant Japanese Painted Fern
Plant Japanese Painted Fern in early spring as soon as the soil is workable, or in early fall at least six weeks before your first frost, so roots establish in cool weather. In zone 6, the middle of its hardy zones 4 to 9, spring means March to May and fall means August or September.
Month-by-month timing for your zone is on the planting calendar; if you garden near zone 6, the middle of this plant's hardy range, start with zone 6 in March. Derived from the plant's category, zones and bloom months plus typical zone frost dates, not checked separately.
How big does Japanese Painted Fern get?
20 intall5 ft 7 inan adult20 inwideSee Japanese Painted Fern in a garden plan: the planner shows it in 3D beside everything else you add, growing toward this size over the years.
How far apart to plant Japanese Painted Fern
Derived from the mature spread above by a fixed rule, not checked separately: spacing is the spread, center to center.
Space Japanese Painted Fern about 20 in apart, center to center, so each plant has room to reach its full width.
Add Japanese Painted Fern to a garden plan and the planner draws it at its full width, so you see the spacing before you buy.
Where these facts come from
Japanese Painted Fern's height, spread, hardiness zones, sun, water and trait tags were checked against 7 published sources on October 29, 2026. Each one is linked below with every fact it carried, which can include a fact this page still marks as not yet checked, because a source carrying a value is not the same as the value being held to the standard. Facts not in that list, and the planting, spacing and size sections, are not covered by these sources. Bloom was checked as well: Japanese Painted Fern bears no flowers, so there is no bloom window for a source to carry.
- NC State ExtensionPlant Toolboxheight, spread, hardiness zones, sun, water and trait tags
- Missouri Botanical Gardenheight, spread, hardiness zones, sun and trait tags
- North Creek Nurseriesheight, spread, hardiness zones, sun and trait tags
- Chicago Botanic Gardenheight, spread, hardiness zones and sun
- Chicago Botanic Gardenheight, hardiness zones, sun and trait tags
- RHSRoyal Horticultural Societysun and water
- Missouri Botanical Gardensun
How the checking works, and what each standard covers, is on the verified plants page.
Good to know about Japanese Painted Fern
Curated from university extensions, botanic gardens and other primary sources, with the source named on every note. A note reports what its source says; where that differs from a fact above, the fact above is this entry's stored value, and its mark says whether it has been checked.
Worth knowing
The silver-and-wine color is light-dependent: it glows in bright dappled shade with gentle morning sun, mutes to gray-green in deep shade, and scorches in hot afternoon sun. per NC State and Clemson
Zone range varies by source
NC State lists zones 4 to 9, Missouri Botanical Garden 3 to 8. The stored 4 to 8 is a fair center; check your own winters. per NC State and Missouri Botanical Garden
Deer and rabbit resistant
Deer and rabbits seldom bother it, but it is not deer-proof: Maryland ranks it 'Seldom Damaged,' below the top fern tier, so protect it where deer pressure is high. per NC State and University of Maryland
A true fern
A true fern, unlike asparagus fern, which is not a fern and is listed as toxic to dogs and cats by NC State Extension. per NC State
Dies back every winter
The fronds die back completely in autumn and the plant re-emerges from its rhizome in spring. Cut the old fronds away after they collapse or in early spring. per NC State and Clemson
Slow, stays put
It spreads only slowly by short rhizomes into a widening clump or loose patch, never running like ostrich fern, so it stays where you plant it and divides easily. per NC State and Missouri Botanical Garden
What pairs well with Japanese Painted Fern
Good companions share its growing conditions and add something it lacks: an earlier or later bloom, a lower carpet in front, or structure through winter.
Rosebay Rhododendron
Shares part shade and moderate water; evergreen, so the bed keeps its shape through winter; stands well above at 11 ft, a canopy to plant beneath.
Evergreen Huckleberry
Shares part shade and moderate water; evergreen, so the bed keeps its shape through winter; taller at 7.5 ft, for the layer behind it.
Mountain Laurel
Shares part shade and moderate water; evergreen, so the bed keeps its shape through winter; taller at 9 ft, for the layer behind it.
Western Wild Ginger
Shares part shade and moderate water; evergreen, so the bed keeps its shape through winter; lower at 8 in, for the front of the border.
Woodland Stonecrop
Shares part shade and moderate water; evergreen, so the bed keeps its shape through winter; lower at 8 in, for the front of the border.
Western Sword Fern
Takes part shade to full shade and moderate water; evergreen, so the bed keeps its shape through winter; taller at 3.5 ft, for the layer behind it.
Northern Sea Oats
Shares part shade and moderate water; its seed heads stand through winter, for structure and the birds; taller at 3.5 ft, for the layer behind it.
Zigzag Goldenrod
Shares part shade and moderate water; its seed heads stand through winter, for structure and the birds.
All 8 companion pairings for Japanese Painted Fern →
Try Japanese Painted Fern with its top companions in a garden →
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Drop this plant onto a 3D plan, see how it fills in, and watch your whole garden bloom across the year.