Tennessee Ostrich Fern, Glade Fern, Narrow Leaf Spleenwort, Narrow Leaf Glade Fern

Diplazium pycnocarpon

Family: Woodsiaceae
Genus: Diplazium (dy-PLAY-zee-um) (Info)
Species: pycnocarpon (PIK-no-kar-pon) (Info)
Synonym:Asplenium pycnocarpon
Synonym:Athyrium pycnocarpon
Synonym:Homalosorus pycnocarpos



Foliage Color:

Unknown - Tell us

Bloom Characteristics:

Unknown - Tell us

Water Requirements:

Requires consistently moist soil; do not let dry out between waterings

Where to Grow:

Unknown - Tell us


36-48 in. (90-120 cm)


24-36 in. (60-90 cm)


USDA Zone 4a: to -34.4 C (-30 F)

USDA Zone 4b: to -31.6 C (-25 F)

USDA Zone 5a: to -28.8 C (-20 F)

USDA Zone 5b: to -26.1 C (-15 F)

USDA Zone 6a: to -23.3 C (-10 F)

USDA Zone 6b: to -20.5 C (-5 F)

USDA Zone 7a: to -17.7 C (0 F)

USDA Zone 7b: to -14.9 C (5 F)

USDA Zone 8a: to -12.2 C (10 F)

USDA Zone 8b: to -9.4 C (15 F)

USDA Zone 9a: to -6.6 C (20 F)

Sun Exposure:

Partial to Full Shade



Bloom Color:

White/Near White

Bloom Time:



Grown for foliage



Other details:

Unknown - Tell us

Soil pH requirements:

6.1 to 6.5 (mildly acidic)

6.6 to 7.5 (neutral)

Patent Information:


Propagation Methods:

By dividing the rootball

From spores

Seed Collecting:

Unknown - Tell us


This plant has been said to grow in the following regions:

Tuscaloosa, Alabama

Winter Haven, Florida

Tennille, Georgia

Marshall, Indiana

Cherry Valley, New York

Cleveland, Ohio

Brookhaven, Pennsylvania

Hermitage, Pennsylvania

Franklin, Tennessee

Lipan, Texas

Santo, Texas

South Jordan, Utah

Wytheville, Virginia

show all

Gardeners' Notes:


On Mar 10, 2016, Rickwebb from Downingtown, PA wrote:

A handsome fern native to southern Ontario & Quebec, Minnesota to Vermont down into Georgia to Louisiana, not common in nature, occasionally here and there. Soft green leaves are soft with long leaflets and simply pinnate. Likes moist ground, slightly acid to neutral pH, and full light shade best. It has fertile fronds in the center of the clump that have smaller leaves and two rows of long-shaped sori below the leaves. It usually has 5 to 6 long fronds per clump and it spreads by underground creeping stems.


On May 8, 2010, bottlegreen from Saint Paul, MN wrote:

The photograph of this fern offered by Garden Harvest Supply certainly doesn't look like Athyrium (Diplazium) pycnocarpon, nor does their description of the fern as "lacy" sound like the real thing. I'm on my second attempt to grow this from spores. This time I've actually gotten gametophytes, but they don't seem to be having sex. Any suggestions?


On Apr 24, 2010, GranMona from Franklin, TN wrote:

Bought @ end of season, 10/09...8 inch pot. Intended to plant or garage for winter, but forgot. I left it outside, under the eave of our 2 story house. We had a very harsh winter in Franklin, Tn and I expected the little feller to be dead....but I was WRONG! He's sprouted, I moved him to a bigger pot, and he's so happy!
I expect to leave him in this big pot, due to heavy spreading I've read about. Anyone else in middle Tennessee have the same guy? What can you share? I was truly amazed with the plant, after our harsh winter. I will probably garage him this winter, unless someone in zone has comments? Also, I plan to start a fern garden...hints appreciated and cuttings as well.
Happy Spring


On Feb 20, 2009, wormfood from Lecanto, FL (Zone 9a) wrote:

I just picked up a 4-pack at local box store for 5bucks. They look pretty good, starting to sprout in the bag. Planting today in yogart containers with potting mix that has the wetting agent added.. They are long tubers and I'm planting them longways 1/2" deep. I'll keep this updated. BTW, there were 6 in the package.


On Oct 7, 2004, tcfromky from Mercer, PA (Zone 5a) wrote:

This plant is of special concern in Wisconsin (and possibly other states as well). The name is translated as: Diplazium: Greek diplasion for "double", referring doubled spore cover
pycnocarpon: pycnos for "compact, close"; carpos for "fruit"