Ornamental · Onocleaceae
Ostrich Fern
Matteuccia struthiopteris
Give it shade and steady moisture, and this hardy fern launches knee-high fronds shaped like green shuttlecocks.
Partial shade
Every 3–7 days
USDA 3–7
3–6 ft · 0.9–1.8 m
Overview
Few ferns reward a shady corner as generously as the ostrich fern, and it ranks among the easiest hardy ferns anyone can grow. Its tall, arching fronds burst upward and fan out like the plumes of a shuttlecock, and the plant powers through winter down to -40°F (-40°C), thriving in zones 3 through 7 where plenty of ornamentals throw in the towel. Hand it a damp, shaded spot and it builds a lush colony almost entirely on its own.
Get two things right and it takes off: shade and water. This is a plant of cool, moist woodland and stream banks, so it sulks the moment it lands on hot, dry, open ground. Plant it where the soil stays damp and the afternoon sun never lands, and it shoots up fronds that stand 3 to 6 feet (90 to 180 cm) tall.
One habit is worth flagging before you dig in. The fern runs underground runners and keeps pushing its patch wider, so give it elbow room or fence it in. Then there is the payoff so many growers chase, the fiddlehead, the tightly coiled crown you harvest in early spring as a foraged vegetable, and it eats brilliantly once it is cooked through.
Care
The short version: part to full shade with rich, consistently moist soil that never dries out, and this fern takes off. Mulch to trap the damp and cool the roots, feed lightly in spring, and give the colony room or a root barrier to steer its eager spread.
Light
Give this fern part to full shade. It handles a little morning sun where the soil stays wet, but hot afternoon sun torches the fronds and slams the plant into early dormancy, so shade keeps it cranking.
Water
Keep the soil consistently moist to wet and never let it dry out. Built for streambanks and damp woodland, it crashes fast in a hot, dry spot. In a normal spell, water every 3 to 7 days, and pour it on wetter when the heat spikes.
Soil
Plant it in rich, humusy ground that holds moisture, and even heavy clay is no problem, since it tolerates clay well. A pH anywhere from 5.0 to 7.0 works, so most garden soil is game as long as it stays damp.
Temperature
Cold does not faze this one, with hardiness running from -40°F to 86°F (-40°C to 30°C). The top of that range is the real catch, since steady heat is what tips the fronds into their summer slump.
Humidity
It loves the moist air of a shaded, damp spot, roughly 40% to 70%. Outdoors that sorts itself out once the soil and shade line up, so there is nothing extra to chase.
Feeding
Feed lightly in spring with a balanced fertilizer, or just topdress with compost or leaf-mold mulch. A fern parked in good woodland soil barely asks for more.
Pruning
Pruning is a breeze. Cut back any tattered or browned green fronds in late fall or early spring before the new fiddleheads pop, and you can leave the brown fertile fronds standing over winter for interest, then trim them in spring.
Repotting
This is no container plant, so skip the repotting. Instead, lift and divide a congested colony every 3 to 4 years once the crowns crowd and the fronds start coming up smaller and weaker.
Size & spacing
Mature fronds shoot up to 3 to 6 feet (90 to 180 cm) tall, and a colony spreads 2 to 8 feet (60 to 240 cm) wide over time. Plant with that eventual sprawl in mind, or rein it in with a root barrier.
When to plant
This fern comes out swinging in spring and coasts through summer. Set new plants out in spring once the frost clears, or in early fall, and snatch the coiled fiddleheads in early spring as the crowns push up but before the fronds unfurl. Do not be thrown when the fronds tire and brown by midsummer, since the plant is just dropping into its natural rest.
Northern hemisphere
Southern hemisphere
Typical months for a temperate climate: start earlier in warm zones, later where spring frosts linger.
- Plant: Spring after frost, or early fall
- Harvest: Non-flowering; harvest fiddleheads in early spring as the coiled crowns emerge, before the fronds unfurl
Hardiness
USDA hardiness zones: 3–7
Temperature: down to -40°C
Troubleshooting
An ostrich fern hands you barely any trouble, and most of what looks off is just the plant answering heat or running out of room. Scan the signs below before you leap to a fix. Nine times out of ten, the cure is shade, water, or a spade.
Crowns shooting up well past the original clump
That is the fern's spreading habit flexing, not a disease. Underground stolons fire off runners that surface as brand-new fiddlehead crowns, and a thriving colony just keeps marching outward. Dig out the wanderers in spring or fall, or drop in a deep root barrier, and the patch holds exactly where you point it.
Fix:
- Dig out unwanted crowns and runners in spring or fall
- Install a physical root barrier to contain the colony
- Divide and relocate or discard excess crowns
Fronds crisping brown and frayed at high summer
Half the story here is summer dormancy, the ostrich fern's built-in habit of winding down once the heat rolls in. The other half is real heat and drought stress, which too much sun and dried-out soil only crank up. Soak it deeply, pile on mulch to trap moisture and cool the roots, and the crown comes roaring back with fresh fronds next spring.
Fix:
- Water deeply to keep soil consistently moist
- Mulch to retain moisture and cool the roots
- Provide more shade in hot climates
- Remove tattered fronds; the plant rebounds from the crown the following spring
Toxicity
Great news for a home full of animals: the ostrich fern carries no known toxins and is not flagged as a poison to pets or livestock. People happily eat its fiddleheads too, though only after a solid cook. The one real caution is cooking your own foraged fiddleheads, not a pet brushing past the plant.
Safe for
People · Cats · Dogs · Horses · Rabbits · Livestock · Birds
Cats None
Nothing on record points to this fern poisoning cats, so a cheeky nibble should pass without drama. Push past that into a full-on greenery binge and a cat might cough a little back up or pass a soft stool, and that clears fast.
Dogs None
Dogs face no known poisoning from this fern, so a chewed frond is not worth a second thought. A sensitive stomach might grumble for a day at the very most before bouncing back.
Horses None
Ostrich fern has no record of harming horses at all. It is not the bracken that stirs up pasture trouble, so a grazing horse can crop right past it.
Rabbits None
Rabbits can tuck into the fronds with no known ill effect. Ease it in slowly though, just like any new green, so their gut keeps pace.
Livestock None
Cattle, goats, and sheep can graze around an ostrich fern with zero worry, since it packs none of the toxins that make bracken a problem. It fits right into a mixed pasture.
Birds None
No toxicity turns up for birds, pet or backyard flock alike. Let a hen peck the fronds and it comes to no harm.
People None
The young fiddleheads are a spring prize once they hit the pot and cook through. Boil them for 15 minutes or steam them for 10 to 12, since raw or barely cooked fiddleheads can make you sick.
No special contact precautions are documented. If foraging fiddleheads for food, rub off the brown papery husk, wash, and cook thoroughly (boil 15 minutes or steam 10-12 minutes); never eat them raw or merely sauteed/stir-fried/microwaved.
Varieties
Most gardens run the plain species and love it, but a handful of selections step up when you want extra size or the true native form. These are the ones worth knowing by name.
'The King'
The showstopper of the bunch, packing a heavy crown and fronds about half again as large, sometimes shooting up close to 7 feet tall.
'Jumbo'
A powerhouse large-fronded form to grab when you want the biggest shuttlecock the plant can throw.
subsp./var. pensylvanica
The North American native form of the species, standing apart from the Eurasian populations of the same fern.
How to propagate
Multiplying an ostrich fern is almost too easy, since the plant is already busy cloning itself underground and just asks you to lift and move the results.
DivisionEasy
Spring as crowns emerge, or early fall · 1 to 2 growing seasons
Lift and split the crowns as they wake in spring, or hold out for early fall, and one clump quickly becomes several. The fern practically hands you free plants, throwing underground stolons that surface as offset crowns you can slice away and replant in minutes. Give a transplant 1 to 2 growing seasons to dig in and start firing up full-sized fronds. Out in the wild it self-sows from spores on the brown fertile fronds, but in the garden division wins hands down every time.
Myths
Fiddleheads are fair game raw or hardly heated, just like any spring green.
Hold that thought. Raw and undercooked fiddleheads have sparked foodborne-illness outbreaks across the US and Canada since 1994, hitting with nausea, vomiting, cramps, diarrhea, and headaches. Rub off the brown husk, then boil them 15 minutes or steam them 10 to 12 minutes. A fast saute, stir-fry, or microwave zap simply will not get them hot enough for long enough.
Every fern hands you fiddleheads you can eat.
Only the ostrich fern's fiddleheads earn a spot on the plate, and even then only after a full cook. Bracken and other ferns can be toxic or even cancer-causing, so nailing the ID comes first, before anything drops into the pot.
Ostrich fern is purely a Eurasian arrival, out of place in North America.
Not a chance. This fern is native to both Eurasia and North America, and the home-grown form even carries its own name, M. struthiopteris subsp./var. pensylvanica.