Hay-scented fern

Sun

Partial shade to full shade; tolerates some sun where the soil stays moist.

Water

Moderate; keep moist while establishing. Established colonies tolerate occasional dry spells, although fronds may brown early.

Soil

Humus-rich, well-drained soil, preferably acidic. Tolerates rocky, relatively lean woodland soil; avoid persistently waterlogged ground.

Height

1-3 ft (0.3-0.9 m)

Spread

2-3 ft (0.6-0.9 m) initially; colonies can spread much farther.

Foliage

Soft, finely divided, triangular to lance-shaped fronds, light green in spring and summer, often turning yellow before dying back in autumn.

Growth

Fast once established, spreading by shallow creeping rhizomes.

Care needed

Low

• Deer resistant
• Cold hardy
• Wildlife
• Low allergen
• Fragrant

Northern hemisphere months. In Australia, shift them by six.

Difficulty

Easy

Toughness

Very tough

Pick your zone, country, light and whether you have pets.

1. Planting day

   1 ft (0.3 m)

2. After 1 year

   1.5 ft (0.45 m)

3. After 2 years

   2 ft (0.6 m)

   full size

About 2 years to full size.

From a typical nursery size, at an average rate for this kind of plant. A rule of thumb, not a forecast.

Cats and dogs

Mildly toxic: may upset a stomach

In the garden

Spreads vigorously: plan to contain it.

Growth rate

Fast

• Water through the first growing season whenever the soil begins to dry.
• Apply a thin mulch of leaf mould each spring, keeping emerging crowns uncovered.
• Do not routinely fertilize; rich feeding is unnecessary and can encourage more spread.
• Remove wandering rhizomes at the colony edge before they reach neighbouring plants.
• Divide established patches in spring if you need more plants or want to reduce their size.

Pruning. Cut dead fronds to ground level in late winter or early spring before new fiddleheads emerge. Leave healthy green fronds intact during the growing season.

Late winter

Remove collapsed dead fronds before new growth starts.

Spring

Plant or divide while conditions are cool and the soil is moist.

Mid-spring

Spread a thin layer of leaf mould around the plants.

Summer

Water young plants during dry spells and check established colonies for encroaching rhizomes.

Autumn

Enjoy the yellowing foliage, then allow fallen leaves to remain as a light woodland mulch.

• Plant broad drifts beneath deciduous trees for a soft, continuous woodland floor.
• Use on shaded banks where spreading rhizomes can help cover exposed soil.
• Combine with established woodland shrubs, leaving space around their bases for access.
• Use as a light-green foreground to dark evergreen shrubs, keeping delicate perennials outside the colony.

Garden styles it suits: Woodland, New England, Rewilded, Green on green and Low-maintenance.

Plant it with: Witch hazel, Mountain laurel, Red oak and White wood aster.

Wildlife: Provides low cover for small woodland animals. Deer usually avoid it, which can allow colonies to dominate heavily browsed woodland; dense stands may suppress other ground-layer plants.

• Unwanted spread: dig out advancing rhizomes and loose fragments; choose a less vigorous fern for small mixed borders.
• Brown or scorched fronds: reduce afternoon sun and water during prolonged drought; established plants may regrow the following spring.
• Poor growth in saturated soil: improve drainage or move plants to a freely drained site.
• Slugs or snails damaging young growth: inspect emerging fronds and remove pests by hand; use an approved iron-phosphate bait if needed.

Reliable species-specific toxicity information for people, cats, dogs and horses is limited, so safety and the likely severity of poisoning cannot be stated confidently. Do not eat the fiddleheads or other parts, discourage pets from chewing fronds or rhizomes, and keep it out of horse grazing areas as a precaution.

Where it spreads. Spreads aggressively within its native range in the eastern United States and eastern Canada, especially in disturbed or heavily deer-browsed woodland. It can form dense colonies that inhibit tree seedlings and other woodland plants; this is aggressive native behaviour rather than evidence of introduced invasive status.

• New York fern (Thelypteris noveboracensis)

  Its frond narrows markedly towards both the tip and the base, with very small lower leaflets. Hay-scented fern has a broader, more triangular blade and a hay-like scent when bruised.

• Lady fern (Athyrium filix-femina)

  Lady fern usually grows in distinct clumps rather than running colonies; its spore clusters are elongated or curved rather than the small marginal cups of hay-scented fern.

• Bracken (Pteridium aquilinum)

  Bracken has a coarser blade divided into three main branches and is often much taller. Hay-scented fern has a single finely divided, tapering blade.

The common name refers to the scent of freshly cut hay released by bruised or drying fronds.

Propagation. Divide creeping rhizomes in early spring, keeping roots and at least one growing point on each piece, and replant promptly. It can also be raised from spores, but this is much slower.

Accepted botanical name

Sitobolium punctilobum Dennstaedtia punctilobula is an older name for Sitobolium punctilobum.

Sources: GBIF (CC BY 4.0). The care and design notes are LandscapeGPT's own.