Log fern
Dryopteris celsa · Polypodiaceae
Tall, narrow, upright, glossy fronds. A natural hybrid of two wood ferns, found on rotting logs in the swamps of the Southeast.
- Size
- 3½ ft tall, 24 in wide
- Zones
- 5 to 9
- Light
- Part shade to shade
- Flowers
- Grown for its leaves
- Pets
- No toxicity recorded
- Job in a bed
- Drift
A bed built around log fern
The planner designed this bed around log fern when this page was made: a 12 × 6 ft (3.7 × 1.8 m) English border in zone 6, part shade. It chose the other plants from the 513 that suit those conditions, and says below why log fern stands where it does.
The plants
- 1 Log fern × 3, dark green leaves
- 2 Blue star creeper × 15, blue
- 3 Lungwort × 3, pink
- 4 Turtlehead 'Hot Lips' × 5, pink
- 5 Bleeding heart × 1, white
- 6 Siberian bugloss 'Jack Frost' × 3, blue
- 7 Double snowdrop × 12, white
- 8 Snowdrop × 12, white
Why this plant
- The only plant grown for its leaves. Leaf lasts all season, where a flower lasts a few weeks.
Why here
- Anchors a back corner. At 3½ ft it is the tallest plant here, and the tallest close the ends of the bed, where they stand in front of nothing.
- A step in the back row. Next to bleeding heart (2½ ft): no two neighbours there are the same height, so the back steps up and down like a skyline.
- 3 plants in one group. Massed, one kind reads as a single shape. Scattered, it would look spotty.
Why now
- Here for its leaves, into winter. They cover the 9 weeks between early March and late November when nothing on the plan is in flower.
Planned as an English border: 6 of the 7 groups (86%) are drifts, longer along the bed than they are deep. White is the colour seen most, on 3 of the 7 kinds grown for their flowers. Blue star creeper is planted in four places along the bed, which gives it rhythm.
The planner's own design check: 13 Excellent, 4 Good. It flags one thing to watch: Nothing on this plan is highly poisonous or an aggressive spreader.
Open this bed in the planner Change its size, the sun or the style, move plants about, or swap one for another.
Where log fern goes in a border
At 3½ ft it belongs at the back of a bed. In the planner's ten height classes it is moderately tall (3 to 4 ft).
Its job: drift. Planted in a small group of three or five, and repeated further along in the other number.
A vertical fern that fits in a narrow space. It tolerates heat and humidity, and wet soil, better than most wood ferns.
- Upright form in a shade bed
- Hot, humid gardens
- Moist woodland
What to plant with log fern
Plants recorded as good partners for it, and what each pairing does:
- Hosta: bold leaves against its medium ones; low enough (18 in) to stand in front of it; happy in the same moist soil.
- Foamflower: adds the flowers, late April to late May; low enough (10 in) to stand in front of it; happy in the same moist soil.
- Virginia sweetspire: adds the flowers, early June to early July; happy in the same moist soil.
Questions about log fern
Does log fern need sun or shade?
Log fern grows in part shade (2 to 4 hours of sun, mostly in the morning) and shade (less than 2 hours of direct sun, or bright dappled light). It is one of the few that also put up with deep shade.
It wants soil that stays evenly moist, rich in organic matter, and a good soak in dry spells. It copes with soil that stays wet.
What zones does log fern grow in?
USDA zones 5 to 9. It is hardy to zone 5, which means it survives winter nights down to about −10 °F (−23 °C).
Gardening in Canada? Use the USDA zone for your town: Canada's own zone map uses different numbers.
How far apart should log fern be planted?
20 in (50 cm) apart, from the middle of one plant to the middle of the next. That is a little closer than its full width of 24 in (60 cm), so a group knits into one patch.
It grows 3½ ft (110 cm) tall. Give it the full distance from anything taller, or it will lean out towards the light.
How many log fern plants do I need?
At 20 in apart, set out in staggered rows:
- 4 to fill 10 square feet (about 1 m²)
- 7 for a single row 10 ft (3 m) long
- 14 to fill a 4 × 8 ft bed on its own
In a mixed border, plant it as a group of three or five, with a second group further along in the other number.
In the bed above, the planner used three in one group.
Is log fern poisonous to dogs and cats?
No toxicity is recorded for dogs, cats, horses or people, according to NC State Extension.
"Not toxic" is not "edible": a pet that eats a lot of any plant can be sick.
Do deer eat log fern?
Mostly not. NC State lists it as resistant to deer. No plant is proof against a hungry deer in a hard winter, but this one is low on the menu.
What does log fern look like in winter?
Log fern holds some of its leaves into winter, more in a mild year or a sheltered spot, and they look tired by March. Cut the old ones off as new growth starts.
More Dryopteris
- Autumn fern Dryopteris erythrosora
- Autumn fern 'Brilliance' Dryopteris erythrosora 'Brilliance'
- Champion's wood fern Dryopteris championii
- Dixie wood fern Dryopteris x australis
- Evergreen wood fern Dryopteris intermedia
- Golden-scaled male fern Dryopteris affinis
- Goldie's wood fern Dryopteris goldiana
- Male fern Dryopteris filix-mas
- Marginal wood fern Dryopteris marginalis
- Southern wood fern Dryopteris ludoviciana
- Wallich's wood fern Dryopteris wallichiana
In these guides
Every fact on record
- Type
- Fern
- Size
- 3½ ft (110 cm) tall, 24 in (60 cm) wide
- Plant
- 20 in (50 cm) apart
- Height class
- Moderately tall (3 to 4 ft)
- Place in the bed
- Back
- Flowers
- None: grown for its foliage
- Leaves
- Medium texture, semi-evergreen; dark green
- Shape
- Upright, clumping
- Hardy in
- USDA zones 5 to 9
- Light
- Part shade, shade
- Soil
- Rich, evenly moist
- Water
- Moderate
- Feeding
- None needed
- Family
- Polypodiaceae
- Comes from
- North Central & Eastern U.S.A
- Stands up to
- Deer, wet soil, deep shade
Checked against NC State Extension. Flowering times are for zone 5: later in colder zones, earlier in warmer ones. Toxicity and spread information is a general gardening guide, not veterinary or medical advice, and invasive status varies by region. If a person or pet eats a plant, contact poison control or a vet. Check your local invasive species list before planting anything with a spread warning.