Illustration
Maidenhair Fern
Adiantum
Maidenhair 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 Maidenhair Fern
Plant it in full shade. It prefers high water. It is hardy in USDA zones 3–8. Expect it to reach about 16 in tall and 16 in wide at maturity, in roughly 3 years (not yet checked).
No toxicity note is on file for Maidenhair 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 Maidenhair Fern
Plant Maidenhair 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 5, the middle of its hardy zones 3 to 8, spring means April to June and fall means August or September.
Month-by-month timing for your zone is on the planting calendar; if you garden near zone 5, the middle of this plant's hardy range, start with zone 5 in April. Derived from the plant's category, zones and bloom months plus typical zone frost dates, not checked separately.
How big does Maidenhair Fern get?
16 intall5 ft 7 inan adult16 inwideSee Maidenhair 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 Maidenhair Fern
Derived from the mature spread above by a fixed rule, not checked separately: spacing is the spread, center to center.
Space Maidenhair Fern about 16 in apart, center to center, so each plant has room to reach its full width.
Add Maidenhair 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
Maidenhair Fern's height, spread, hardiness zones, sun and trait tags were checked against 2 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.
- Clemson Home and Garden Information CenterClemson Cooperative Extension HGIC, Maidenhair Fernheight, spread, hardiness zones, sun and trait tags
- NC State ExtensionAdiantum, genus pagesun and trait tags
How the checking works, and what each standard covers, is on the verified plants page.
Good to know about Maidenhair 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 whole plant hangs on one trait: thin, wiry, polished black stems fork and fan out light-green leaflets in horseshoe whorls. That dark wire against airy foliage names the fern. per Mt. Cuba
Soil pH: sources disagree
Some sources call it acidic-preferring, others neutral to fully adaptable. In practice it is pH-adaptable, so give it humus-rich soil and steady moisture and stop worrying about pH. per NC State
Fronds crisp if they dry
Dry soil, hot sun, low humidity, or wind each brown the delicate fronds, sometimes within a day. A dieback in a dry spell usually returns next season. per Wisconsin
Deer and rabbit resistant
Rated highly resistant to deer and seldom browsed by rabbits, which makes it a graceful hosta alternative for shade beds that deer keep chewing. per Clemson
It dies back each winter
Deciduous, not evergreen: fronds yellow and die to the ground in autumn, and new pink-to-purple fiddleheads unfurl in spring. Cut old fronds before they emerge. per NC State
Slow, well-behaved spreader
It creeps slowly by rhizomes into graceful colonies, not an aggressive runner like ostrich fern. Lift and divide established clumps in spring to make more. per NC State
What pairs well with Maidenhair 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
Takes part shade to full shade and moderate to high 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
Takes part shade to full shade and moderate to high water; evergreen, so the bed keeps its shape through winter; taller at 6 ft, for the layer behind it.
Christmas Fern
Shares full shade and moderate to high water; evergreen, so the bed keeps its shape through winter; both are North American natives.
Summersweet
Takes part shade to full shade and high water; taller at 6 ft, for the layer behind it; both are North American natives.
Autumn Fern
Takes part shade to full shade and moderate to high water; evergreen, so the bed keeps its shape through winter.
Holly Fern
Shares full shade and moderate to high water; evergreen, so the bed keeps its shape through winter.
Hellebore
Takes part shade to full shade and moderate to high water; evergreen, so the bed keeps its shape through winter.
Camellia
Takes part shade to full shade and moderate to high water; evergreen, so the bed keeps its shape through winter; taller at 6.5 ft, for the layer behind it; they only overlap in zones 7 to 8.
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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.