Ornamental · Dennstaedtiaceae
Hay-scented Fern
Dennstaedtia punctilobula
A forgiving native fern that carpets shade with soft, hay-scented fronds and asks almost nothing of you.
Partial shade
Every 5–10 days
USDA 3–8
12–24 in · 30–60 cm
Overview
If you're new to ferns, hay-scented fern is a wonderful place to start. This eastern North American native takes a shady, forgotten corner and fills it with soft, lacy yellow-green fronds that ask for very little. Brush a leaflet or crush it between your fingers and you'll catch the sweet smell of fresh-cut hay behind its name. It happily settles into lean, rocky ground that would stump plenty of other plants, so you can feel confident giving it a try.
The one thing to know before you plant is how much it likes to roam. It travels on shallow creeping rhizomes to build up dense, generous colonies, which makes it a gift for covering a bank, a wood edge, or a wide stretch of dry shade. That same eagerness can feel like too much in a neat little border, so pick its spot thoughtfully and you'll avoid any regret down the road.
It is also wonderfully tough, holding steady through hard winters and brushing off the deer and rabbits that graze most other plants bare. Offer it the part shade and acidic soil it favors and it will ask almost nothing more, returning fresh every spring even if you forget all about it. Mistakes here are easy to recover from, so plant it and enjoy watching it thrive.
Care
The short version: part shade and acidic, humusy soil make it happiest, though it will forgive you and take anything from full sun to full shade and poor, rocky ground. Keep it evenly moist its first year and through hot spells, and after that you can simply let it settle in and spread.
Light
This fern will grow for you in nearly any light, from full sun to full shade, though partial shade is where it looks happiest and healthiest. In a hot, bright spot the fronds can scorch and brown unless you keep the soil nicely moist, so lean toward more shade the warmer your summers get.
Water
Keep the soil evenly moist through that first growing season and whenever hot, dry weather sets in, especially in sunnier spots where it needs a little extra help. Once a colony has settled it grows fairly drought tolerant and even handles poor, rocky soil, so you can comfortably ease off the watering for established plants.
Soil
It loves acidic, humusy loam but it won't hold you to it, taking poor and rocky soils in easy stride. Any pH from 4.5 to 7.0 suits it fine, with the acidic end pleasing it most.
Temperature
This is a genuinely tough, forgiving fern, hardy from about -31°F to 86°F (-35°C to 30°C). It sails right through hard winters and only feels the strain when summer heat climbs and the soil dries out at the very same time.
Humidity
Plain outdoor air suits it just fine, somewhere around 40% to 70% humidity, so there's nothing for you to chase. Keeping the soil steadily moist through the heat matters far more than any moisture in the air.
Feeding
You can feed it almost never and it will thank you for it. This native is happiest in lean ground, so at most offer a light spring topdressing of compost or leaf mold and skip the fertilizer entirely.
Pruning
Trim back the faded, frost-killed fronds in late winter or early spring, just before the fresh growth pushes up. Where summers run hot you can shear declining fronds in late summer, and they'll reflush for you the following spring. To gently rein in the spread, lift out the creeping rhizomes around the colony edge.
Repotting
It's seldom grown in pots, so for you this really just means dividing. Lift and split crowded plantings every 2 to 3 years to freshen them up or to keep the spread comfortably in check.
Size & spacing
Each plant reaches 12 to 24 inches (30 to 60 cm) tall while it creeps 2 to 4 feet (60 to 120 cm) wide and keeps on going. Give it plenty of elbow room from the start, or simply enjoy watching it close the gaps for you.
When to plant
Hay-scented fern is a cold-hardy perennial that thrives across USDA zones 3 to 8. Set your new plants out in spring once the soil can be worked, keep them watered through that first summer, and you'll enjoy their soft green from spring right up until frost gently browns the fronds.
Northern hemisphere
Southern hemisphere
Typical months for a temperate climate: start earlier in warm zones, later where spring frosts linger.
- Plant: spring
Hardiness
USDA hardiness zones: 3–8
Temperature: down to -40°C
Troubleshooting
This is a genuinely easy-going fern, so there is little to fuss over, and what does come up usually traces back to one of two things: heat drying out the fronds, or the colony reaching farther than you had in mind. Find your symptom below and step in early, and you'll have it back on track in no time.
Fern wandering out of its bed and over its neighbors
Don't panic if it starts pushing well past where you set it, because that is just its eager rhizomes doing what comes naturally and sending up fresh fronds farther out. You can sink a root barrier or keep it to a bed of its own, then lift the creeping rhizomes along the colony edge each spring to hold the line. The kindest thing you can do is simply keep it clear of slow, treasured perennials it might smother.
Fix:
- Install a root barrier or grow in a contained bed
- Dig and remove rhizomes at the colony edge each spring
- Avoid planting next to choice, slow-growing perennials
Fronds turning crisp too soon in summer warmth
If your fronds go pale and brown before autumn arrives, the culprit is almost always heat and dryness in a spot that bakes and loses its moisture. Give it a good deep soak through warm weather, offer it a little more shade if your summers run hot, and lay down mulch to hold water at the roots. Take heart if the browning shows up only as the days cool, since that is simply your fern resting for winter, and it will come back for you next spring.
Fix:
- Provide consistent moisture during hot, dry weather
- Site in partial to full shade in warm regions
- Mulch to conserve soil moisture
- Shear off declining fronds; plants reflush the following spring
Toxicity
Here's some reassuring news for homes with pets and little ones. Hay-scented fern is a true fern with no known toxins, listed as poisonous to no animal, and it carries no spines or contact irritants to worry about. The only thing to keep an eye on is its love of spreading, which forms dense colonies, so it's a habit to guide in the garden rather than any danger indoors.
Safe for
People · Cats · Dogs · Horses · Rabbits · Livestock · Birds
Cats Non-toxic
Rest easy about a curious cat here, since this is a true fern with no known toxins and a nibbled frond should do no harm. Even so, a big mouthful of any plant can bring on a little drool or a passing tummy upset, so it's worth keeping an eye out.
Dogs Non-toxic
You can relax about your dog with this one, because the lacy fronds hold nothing that will poison them. The only thing to watch is that wolfing down a lot of any greenery can leave a dog with a brief, mild bout of stomach upset.
Horses Non-toxic
Horses are welcome to graze around this fern with no worries at all, as it carries no toxin known to trouble them. At most, a grazing horse might feel a touch of digestive grumbling from the extra roughage, and nothing more.
Rabbits Non-toxic
Rabbits can browse the soft fronds in complete safety, and that easy tolerance is part of why the plant is known for shrugging off rabbit damage. There's simply no poison to fret over in a casual nibble.
Livestock Non-toxic
Cattle, goats, and sheep are perfectly fine around this fern, since it holds no toxin that affects them. Grazing it brings no harm beyond the ordinary roughage any leafy plant provides.
Birds Non-toxic
Your birds are safe among these plants, as the fronds pose them no danger. Hens and other backyard birds can peck and scratch happily here, because there's nothing toxic in the foliage.
People Non-toxic
This is a lovely, worry-free fern to handle and to grow where children play. It has no spines or contact irritants, and crushing a frond simply gives you that sweet, fresh-cut-hay scent.
No spines or known contact irritants; fronds can be brushed or crushed to release the fresh-hay fragrance.
Varieties
There's no hard choosing to do here, which makes things nice and simple, since gardeners grow the wild species just as it comes. This is the one form you'll come across.
Dennstaedtia punctilobula (species)
You'll be growing the wild type itself, prized for its lacy, yellow-green, hay-scented fronds that knit into broad colonies, and there's no need to hunt for cultivars since none have entered the trade.
How to propagate
Making more of this fern couldn't be easier, because it already loves to spread on its own. The dependable route is dividing an established clump, and out in nature it also sows itself gently from spores.
DivisionEasy
Spring or early fall · 1 to 2 growing seasons
The friendliest way to grow your patch is to lift and split the creeping rhizome in spring or early fall, keeping sections that each hold their own fronds and roots. Don't worry if they look small at first, because they root in quickly and fill out into a full stand within 1 to 2 growing seasons. Out in the wild it also sows itself gently from spores tucked along the frond margins.
Myths
Hay-scented fern is a tidy groundcover that stays put where you plant it.
Give it a year or so and it will happily wander. Those shallow rhizomes reach out in all directions to weave a dense colony that can overrun gentler neighbors. Plant it where you'll welcome that spread, or tuck a root barrier around it, and you'll both be happy.
Ferns must have deep shade and soil that never dries out.
This friendly fern happily proves otherwise. It settles in anywhere from full sun to full shade, and once it feels at home it takes dry stretches in stride and even makes itself comfortable on poor, rocky ground where fussier plants would quit.