fern

Odaesan Fern

Dryopteris crassirhizoma 'Odaesan'

Essentials

At a Glance

Plant Type

Fern

Height

30 inches

Width

36 inches

Light

Partial Sun, Shade

Zones

5, 6, 7, 8

Water

Consistent moisture

Humidity

High humidity preferred

Lifespan

Decades

Native To

East Asia

Toxicity

Non-toxic to humans and pets

The Story

Plant Bio

Dryopteris crassirhizoma 'Odaesan' is a robust fern characterized by its arching, pinnate fronds with dark green, leathery leaflets, creating a lush, ferny foliage display ideal for shaded gardens. This cultivar is distinguished by its particularly vigorous growth and resilience in woodland and shaded environments, making it a reliable choice for moist, shaded garden areas.

Uses & Benefits:

Provides lush, green foliage that enhances shaded garden areas.

Helps retain moisture in shady spots, reducing watering needs.

Supports local biodiversity by providing habitat for insects and small animals.

Planting

How to Grow

Select a shady, moist location with well-draining soil.
Tuck fern spores or divisions into the soil in early spring.
Mist cuttings regularly to keep humidity high, taking 4-6 weeks.
Water consistently to keep soil moist but not waterlogged.
Mulch around the base to retain moisture and suppress weeds.
Transplant in early spring or fall for best results.

Pro Tip

Ensure consistent moisture and shade for healthy growth.

Keep It Thriving

Care Guide

Do

Water regularly to keep soil moist 🌱
Mulch to conserve moisture and suppress weeds
Prune dead fronds in late winter

Don't

Avoid direct sunlight which can scorch fronds ❌
Do not let soil dry out completely
Refrain from over-fertilizing, which can cause weak growth

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Divide
Mulch
Spring Cleanup

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Shaded woodland borderMoisture-loving garden bed

Companion Plants

Hostas Astilbes Trilliums Foamflowers Japanese painted fern

Multiply

Propagation Methods

Good to Know

Common Questions

Odaesan Fern questions

What zones can Odaesan Fern grow in?

Odaesan Fern is hardy in USDA Zones 5–8. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Odaesan Fern deer resistant?

Yes — Odaesan Fern is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.

Does Odaesan Fern need full sun?

Odaesan Fern does best in part shade.