Ferns As Groundcovers

Strolling pathways and lanes among magnificent homes on Kiawah Island, I was impressed by the effective use of ornamental groundcovers in the landscapes.

Paths there were many,
Winding through palmy fern, and rushes fenny,
And ivy banks; all leading pleasantly
To a wide lawn, whence one could only see
Stems thronging all around between the swell
Of turf and slanting branches: who could tell
The freshness of the space of heaven above,
Edg'd round with dark tree tops?...

- John Keats - From Endymion: Book I

The ferns were among the loveliest. What makes them so are their rich textures, lush beauty, and low maintenance requirements. Ferns, in fact, could be an elegant answer to your own groundcover needs.

Before delving into the subject of ferns as groundcovers, let's consider the reasons for using groundcovers.

Groundcovers (or ground covers) are going to occur in most climates quite naturally. Just above the soil layer and below native shrubs and trees, herbaceous plants sprout and spread. They are important in the ecosystem for erosion control, providing and balancing plant diversity, conserving soil moisture, and healing the land after some sort of disturbance.

Many natural groundcover species are not all that attractive. Some are harmful; poison ivy comes to mind. Creative gardeners, however, have learned to substitute more desirable plant species to achieve those worthy ends that nature would otherwise accomplish.

So, that brings us back to the subject of ferns as groundcovers. Ferns will not serve as lawn substitutes for they grow too tall and don't survive frequent foot traffic, but it you want plants that do whatever else that groundcovers should do, require minimal maintenance, and are deer-proof, ferns could be your plants of choice.  Choosing the right fern is as simple as identifying the area you want to cover and selecting a suitable species to do it.

Once established, fern groundcovers are very impressive. Here are a few to consider.

Southern Sword Fern

Nephrolepis cordifolia

Nephrolepis cordifolia - aka Southern Sword Fern - is among the most widely used ferns in southeastern U.S. landscapes. They're tough as nails and very easy to grow.  This evergreen species presents upright sword-shaped fronds with closely spaced leaflets. They spread by runners, and tolerate drier, poorer soil than most ferns, especially in shaded areas. They'll also thrive in full sun with sufficient irrigation.

But first, take note. Southern Sword Fern is not native to the U.S., but to Australia and Asia. Therefore, it is sometimes considered to be an invasive species because it competes with native groundcover species - i.e. weeds. But given that it does suppress weeds, it seems like an ideal solution to the weed problem if used judiciously. I'll leave it to you to decide. 

Southern Sword Ferns grows to 18" tall. Recommended soil pH from 5.6 to 7.8. They're cold-hardy only in USDA climate zones 9b - 11, so they're of limited use.

Hay-scented Fern

Dennstaedtia punctilobula

Dennstaedtia punctilobula, also known as Hay-scented fern is a North American native found from Quebec to Georgia, and westward to Missouri and Arkansas. That's USDA climate zones 3 - 8. 

It is deciduous, but the fall foliage turns to a beautiful golden yellow or chartreuse (hay-colored) in fall. Grow it in full shade - not deep shade - to partial shade in soil with average moisture. 

The secret to success with any plant is to approximate it's native habitat in your own landscape. Dennstaedtia thrives in rich, deep, loamy soil with average moisture in deciduous hardwood forests.

Hay-scented fern is best propagated by planting rhizomes in well-prepared soil. It's reasonably drought-tolerant, and, of course, deer won't eat them.

Christmas Fern

Polystichum acrosticoides

This evergreen beauty is one of our most useful native ferns. Polystichum acrosticoides really stands out in winter. Also known as Christmas fern, the glossy foliage has been gathered since colonial times for Christmas greenery. I never fail to point out to my grandchildren that the leaflets are shaped like elves' shoes. 

It can be found growing naturally in shady hardwood forests from Quebec to Florida, and westward to Texas (USDA climate zones 3 - 9). Rich, loamy, slightly moist soil is ideal. Nevertheless, Christmas fern is reasonably drought tolerant. They are often available in 3-1/2 inch pots and as bare root crowns.

Autumn Fern

Dryopteris erythrosora

Autumn Fern - aka Dryopteris erythrosora - is an Asian beauty that is becoming very popular. Evergreen fronds grow 18" to 24", and newly emerging foliage has a burgundy tone. Stunning! It's cold hardy, too, thriving from USDA climate zones 5 - 8. The delicate appearance belies its toughness - so tough, in fact, that it is often used in public gardens, squares and avenue median strips, so long as the site is in partial shade to full shade.

Southern Shield Fern

Dryopteris ludoviciana

So, what if you need a fern for a sunny location? Look no further than Southern Shield fern or Southern Wood fern - aka Dryopteris ludoviciana. This gorgeous North American native is found from Kentucky to Florida, and westward to Texas. That's USDA climate zones 6 - 10. Foliage is evergreen, too. It's a big one, growing up to 48" in height! Average, slightly moist soil with pH ranging from 6.1 to 7.5 will be ideal.

There are, of course, many more ferns that could be mentioned. Some are, in my opinion, a bit too small to serve as effective ground covers. Others are gigantic. Many prefer habitats too specific to be of general interest.

I hope that these ferns I've mentioned will provide you with some inspiring choices for your own ground cover needs.

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Southern Wood Fern (aka Florida Shield Fern) For The Southern Garden

Dryopteris ludoviciana

Take a stroll in southern forests draped with Spanish Moss and you'll likely come upon Southern Wood Fern. Its glossy, dark, evergreen fronds make it one of the most beautiful of our native ferns. Its moderate height and adaptability make it one the most useful for the southern garden.

The botanical name is Dryopteris ludoviciana (pronounced dry-OP-ter-iss loo-dough-vik-ee-AH-nuh) which literally means "oak fern from Louisiana." According to the USDA PLANTS database, its range is from North Carolina and Kentucky southward to Florida and westward to Texas. It's usually found growing near the coast or in the coastal plain.

Southern Wood Fern is also known as Aspidium ludovicianum, Dryopteris floridana and Nephrodium floridanum. Guess why? It's found in more places in Florida than in Louisiana. So another common name is Florida Shield Fern.

You don't need to live near the coast to grow Florida Shield Fern. It performs well in USDA zones 6 to 10.

Choose a planting site in full sun to partial shade. Florida Shield Fern prefers moist soil, particularly if planted in full sun. It will tolerate dry soil periodically if planted in partial shade. (Take care not to over-water.) Soil should be high in organic matter and well-drained with pH between 6.1 to 7.5. Take a soil sample to your nearby Cooperative Extension Service for analysis. Follow the recommendations. Such a site as described probably won't require tilling.

Florida Shield Fern grows to 48 inches high and up to 24 inches across. Dig planting holes about 18 inches to 24 inches apart. The holes should be no deeper than that of the root balls. Water the plants in their pots, then plant them, watering more as you go. When planted, the tops of the root balls should be visible; do not bury them under soil.

Florida Shield Fern Fern is deer resistant. It's great in massed plantings and for naturalizing as a ground cover. Include it in fern collections, native plant collections, shade gardens and woodland gardens.

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Must Have Plants: Autumn Fern

Autumn Fern - Dryopteris erythrosora

Must-have plants are among the best plants for appropriate garden situations. When you need great garden plants for ground cover, naturalizing, wildflower gardens, perennial borders, butterfly gardens, hummingbird gardens, herb gardens, heritage gardens, cutting gardens, woodland gardens, shade gardens, bulb gardens, container gardens, bog gardens, water gardens, rain gardens or xeriscaping, look for the best among our must-have plants.

Name(s): Dryopteris erythrosora, Aspidium erythrosorum, Dryopteris bulligera, Dryopteris distantipinna, Dryopteris linyingensis, Dryopteris oblongipinnula, Autumn Fern, Japanese Shield Fern

Flower Color: None

Bloom Time: None

Foliage: Evergreen, burgundy to green.

Height/Spread: 18 inches to 24 inches x 18 inches to 24 inches.

Climate Zones: 5, 6, 7, 8

Sun Exposure: Partial shade to full shade.

Soil Condition: Well-drained, pH 6.1 to 7.5

Features: Drought tolerant, deer resistant, colorful foliage.

Uses: Massed planting, naturalizing, fern collections, Asian gardens, shade gardens, woodland gardens.

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Where The Autumn Fern Grows

Dryopteris erythrosora

Oh, what a glory doth the world put on
These peerless, perfect autumn days
There is a beautiful spirit of gladness everywhere.
The wooded waysides are luminous with brightly painted leaves;
The forest-trees with royal grace have donned
Their gorgeous autumn tapestries;
And even the rocks and fences are broidered
With ferns, sumachs and brilliantly tinted ivies.
But so exquisitely blended are the lights and shades
The golds, scarlets and purples, that no sense is wearied;
For God Himself hath painted the landscape.
-Helen Keller, Autumn

Autumn Fern is one of the most colorful. Other common names include Japanese Shield Fern and Japanese Red Shield Fern. Its botanical name is Dryopteris erythrosora (pronounced dry-OPP-ter-iss ehr-ith-roh-SOR-ra), meaning "oak fern - red sori." The names refer to its habitat among broadleaf evergreen trees and the color of the spore-producing structures under the fronds. Obviously, the fern is native to Japan, but also to China and Korea.

Autumn fern's colors begin in spring when the garnet-red croziers (fiddleheads) begin to emerge. As the fresh young fronds unfurl, their colors change to bronze and finally mature to dark green. Oddly, Autumn ferns are more attractive in spring than autumn, yet the spring colors are reminiscent of fall.

Autumn fern normally grows in loose clumps 18 to 24 inches tall with an equal spread. It prefers partial to full shade in moist, well-drained soil high in organic matter with pH ranging from 6.1 to 7.5. It is hardy from USDA climate zones 5 into 9.

Little soil preparation is needed before planting. Moist, well-drained soil high in organic matter shouldn't need tilling, especially if in a woodland setting. If the soil requires amendment to increase the level of organic matter, some tilling might be required. Remove all traces of weeds. Collect a soil sample and take it to the nearest Cooperative Extension Service office for analysis. Follow the instructions provided.

When planting, water the plants in their pots, then allow the pots to drain. Remove the plants from their pots and place in the planting holes at the same depth they grew previously. Water again. Finally, apply a layer of organic mulch to conserve moisture and discourage weeds.

Gardeners troubled by deer and rabbits will be glad to know that this fern is critter resistant. Similarly, autumn fern is insect and disease resistant.

Autumn fern is ideal as a ground cover for shade gardens and woodland walks, fern collections, and Asian plant collections. Suitable companion plants include Astilbe, Chrysogonum, Galium, Hosta, Heuchera, Hyacinthoides, Sanguinaria, Scilla, Selaginella, and ferns with similar requirements.

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