OrnamentalfernStraightforward

Lady fern

Athyrium filix-femina

Finer, lighter and more delicate-looking than the male fern it is usually planted beside, and correspondingly less tolerant of dryness — this one wants damp shade rather than dry. Fully deciduous, so it disappears entirely over winter.

Position: Full shade or Dappled shade or Partial shade
Water: moderate demand
Drainage: Moisture-retentive, Tolerates wet ground
Grows to: 50–100 cm × 50–80 cm
Hardiness: H7
Difficulty: Straightforward

August

Nothing to do

No sowing, planting, harvesting or pruning window falls in August.

Coming next month: plant.

Lady fern’s year

Resolved for United Kingdom (general). Every window is stored against a climate event rather than a date, so a late frost pocket runs later than the band shows. What else August calls for.

Activity	F	M	A	S
Plant		March.	April.	September.
Prune	February.	March.
Divide		March.	April.

Timing that travels

The band above resolves this plant's windows into months for one region. These are the windows themselves, stored against a climate event rather than a date — which is the form that survives being carried to a colder garden, a frost pocket, or next year.

Conditions it needs

Light: Full shade, Dappled shade, Partial shade
Frost: Very hardy
Hardiness rating: H7 (RHS)
Grows best at: 6–22 °C
Soil: Loam, Peat-free compost, Clay
Soil pH: 5–7
Drainage: Moisture-retentive, Tolerates wet ground
Water needs: moderate
Drought: poor tolerance
Waterlogging: good tolerance
Heat: poor tolerance
Wind and exposure: poor tolerance

Where these figures come from

LightSourced guidancemoderate confidence: Royal Horticultural Society: Lady fern — position
Checked 2026-08-13
FrostSourced guidancehigh confidence: Royal Horticultural Society: Lady fern — hardiness
Checked 2026-08-13
Hardiness ratingSourced guidancemoderate confidence: Royal Horticultural Society: RHS hardiness ratings
Checked 2026-08-13
Grows best atSourced guidancemoderate confidence: Royal Horticultural Society: Lady fern — temperature
Checked 2026-08-13
SoilSourced guidancemoderate confidence: Royal Horticultural Society: Lady fern — soil
Checked 2026-08-13
Soil pHSourced guidancemoderate confidence: Plant Finder — Missouri Botanical Garden: Athyrium filix-femina — culture
Checked 2026-08-13
DrainageSourced guidancemoderate confidence: Royal Horticultural Society: Lady fern — soil
Checked 2026-08-13
Water needsHorticultural consensusmoderate confidence: No external citation — see the evidence type above.
Checked 2026-08-13
DroughtHorticultural consensusmoderate confidence: No external citation — see the evidence type above.
Checked 2026-08-13
WaterloggingHorticultural consensusmoderate confidence: No external citation — see the evidence type above.
Checked 2026-08-13
HeatHorticultural consensusmoderate confidence: No external citation — see the evidence type above.
Checked 2026-08-13
Wind and exposureHorticultural consensusmoderate confidence: No external citation — see the evidence type above.
Checked 2026-08-13

On your soil

Computed by comparing this plant's recorded requirements against each soil's recorded characteristics. A recorded horticultural fact overrides the comparison where GrowingHQ holds one.

Soil	Verdict	Why
Heavy clay	Prefers this soil	Heavy clay suits Lady fern as it stands: The pH suits it: it wants 5 to 7, and this soil is in that range. It tolerates ground that stays wet, which most crops do not. Clay is among the soils it is recorded as suiting. The soil holds moisture, which saves a great deal of watering.
Sandy	Works, with one condition	Lady fern will crop on sandy, but one thing has to be dealt with first. It has little drought tolerance and this soil dries out fast — it will check and bolt in the first dry spell without watering.Water and mulch will carry it through. On this soil the watering is not optional in a dry spell, which is the difference between a crop and a failure.
Chalky and alkaline	Struggles here	Lady fern struggles on chalky and alkaline: The soil is substantially too alkaline for it: it wants pH 5 to 7, and this soil sits around 7.8 to 8.5. It has little drought tolerance and this soil dries out fast — it will check and bolt in the first dry spell without watering. A container or a raised bed of imported soil sidesteps the problem entirely.
Loam	Prefers this soil	Loam suits Lady fern as it stands: The pH suits it: it wants 5 to 7, and this soil is in that range. Loam is among the soils it is recorded as suiting. The soil holds moisture, which saves a great deal of watering.
Silty	Grows well here	Lady fern grows perfectly well on silty without special measures, though it is not the soil it would choose.
Peaty and acid	Prefers this soil	Peaty and acid suits Lady fern as it stands: The pH suits it: it wants 5 to 7, and this soil is in that range. It tolerates ground that stays wet, which most crops do not. The soil holds moisture, which saves a great deal of watering.
Shallow over rock	Works, with one condition	Lady fern will crop on shallow over rock, but one thing has to be dealt with first. It has little drought tolerance and this soil dries out fast — it will check and bolt in the first dry spell without watering.Water and mulch will carry it through. On this soil the watering is not optional in a dry spell, which is the difference between a crop and a failure.
Made ground and urban soil	Grows well here	Lady fern grows perfectly well on made ground and urban soil without special measures, though it is not the soil it would choose.

Not sure which you have? Four hand tests will settle it.

Space and spacing

Mature height: 50–100 cm
Mature spread: 50–80 cm
Rooting depth: 30 cm
Spacing: 50–75 cm apart

Where these figures come from

Mature heightHorticultural consensusmoderate confidence: No external citation — see the evidence type above.
Checked 2026-08-13
Mature spreadHorticultural consensusmoderate confidence: No external citation — see the evidence type above.
Checked 2026-08-13
Rooting depthHorticultural consensusmoderate confidence: No external citation — see the evidence type above.
Checked 2026-08-13
SpacingSourced guidancemoderate confidence: Royal Horticultural Society: Lady fern — spacing
Checked 2026-08-13

Measured centre to centre. Plants set closer than this compete for light and water long before they look crowded, and the crowding cannot be undone once they are in.

Habit and ultimate size

What the plant becomes, rather than what it is when you buy it. The gap between the two is where most planting mistakes live.

Foliage: Deciduous
In a container: Workable in a container, with conditions

Where these figures come from

FoliageSourced guidancehigh confidence: Royal Horticultural Society: Athyrium filix-femina — foliage
Checked 2026-08-13
In a containerHorticultural consensusmoderate confidence: No external citation — see the evidence type above.
Checked 2026-08-13

Where and how you can grow it

Each way of growing is assessed separately, and “not assessed” is a real answer rather than a gap we have filled in with a guess.

Method	Suitability	What it needs
Open ground	Well suited source Sourced guidancemoderate confidence Royal Horticultural Society: Growing method suitability Checked 2026-08-13
Traditional dug bed	Well suited source Sourced guidancemoderate confidence Royal Horticultural Society: Growing method suitability Checked 2026-08-13
Raised bed	Well suited source Sourced guidancemoderate confidence Royal Horticultural Society: Growing method suitability Checked 2026-08-13
Container	Workable source Sourced guidancemoderate confidence Royal Horticultural Society: Growing method suitability Checked 2026-08-13

Growing it

WateringKeep the soil damp through summer. Lady fern is a streamside plant and the fronds brown off early on dry ground — this is the practical difference from the male fern, which the two look far too similar to advertise.
MulchingA thick leaf-mould mulch every autumn does more for a fern than any feeding. It holds moisture, keeps the crown cool and imitates the woodland floor these plants come from.

Where this guidance comes from

WateringSourced guidancemoderate confidence: Royal Horticultural Society: Athyrium — position
Checked 2026-08-13
MulchingSourced guidancemoderate confidence: Royal Horticultural Society: Ferns — cultivation
Checked 2026-08-13

Sources for this page

GrowingHQ editorial synthesis · Plant Finder · Royal Horticultural Society

Each figure on this page carries its own citation, under the “where these figures come from” note in its section. Record last reviewed 2026-08-14.