Illustration
Lady Fern
Athyrium filix-femina
Lady 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 Lady Fern
Plant it in part shade. It prefers moderate water. It is hardy in USDA zones 4–8. Expect it to reach about 2.5 ft tall and 2 ft wide at maturity, in roughly 3 years (not yet checked).
No toxicity note is on file for Lady Fern. That is not a clearance: check its safety for people and pets before planting.
What was checked
Mature height and spread, hardiness zones, sun and the trait tags were checked against named botanical sources for this plant. The bloom months and water need on this page were not, and each fact above says which. 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 Lady Fern
Plant Lady 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 8, 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 Lady Fern get?
2.5 fttall5 ft 7 inan adult2 ftwideSee Lady 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 Lady Fern
Derived from the mature spread above by a fixed rule, not checked separately: spacing is the spread, center to center.
Space Lady Fern about 2 ft apart, center to center, so each plant has room to reach its full width.
Add Lady 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
Lady Fern's height, spread, hardiness zones, sun and trait tags were checked against 4 published sources on July 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.
- Missouri Botanical Gardenheight, spread, hardiness zones, sun and trait tags
- NC State ExtensionPlant Toolboxheight, spread, hardiness zones and sun
- Plant Delights Nurseryheight, hardiness zones, sun and trait tags
- Lady Bird Johnson Wildflower Centerheight and sun
How the checking works, and what each standard covers, is on the verified plants page.
Good to know about Lady 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
Unlike most ferns it takes real sun, but only where the soil stays reliably moist. In dry sun the lacy fronds scorch, so sun and water are linked. per NC State
Zone range differs by source
NC State rates it hardy to zone 3a; Missouri Botanical Garden gives 4 to 8. Both agree it is very cold-hardy, so gardeners in colder zones can try it. per NC State and Missouri Botanical Garden
Deer and rabbit resistant
Rated resistant to deer and rabbits. Deer may nibble the fronds lightly in summer, but the plant is generally left alone. per NC State and Illinois Wildflowers
Spreads slowly, not a runner
It creeps outward slowly by short rhizomes to form patches, but does not take over the way ostrich fern does. A well-behaved shade groundcover. per NC State
Deciduous: bare in winter
It drops its fronds after hard frost and dies back for winter, then unfurls fresh in spring. Plant it over spring bulbs to hide their fading leaves. per NC State
Brittle fronds; shelter from wind
The lacy fronds and stalks are brittle and snap in strong wind, and they tatter by late summer. A sheltered spot keeps them looking good longer. per Missouri Botanical Garden
What pairs well with Lady 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.
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; both are North American natives.
Rhododendron
Shares part shade and moderate water; evergreen, so the bed keeps its shape through winter; taller at 6 ft, for the layer behind it.
Christmas Fern
Takes part shade to full shade and moderate water; evergreen, so the bed keeps its shape through winter; both are North American natives.
Bergenia
Takes part sun to part shade and moderate water; evergreen, so the bed keeps its shape through winter.
Hellebore
Shares part shade and moderate water; evergreen, so the bed keeps its shape through winter.
Autumn Fern
Shares part shade and moderate water; evergreen, so the bed keeps its shape through winter.
Holly Fern
Takes part shade to full shade and moderate water; evergreen, so the bed keeps its shape through winter.
Japanese Forest Grass
Shares part shade and moderate water; its seed heads stand through winter, for structure and the birds.
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