Coastal Wood Fern
Dryopteris arguta
Care
part shade, full shade
low
well-drained, humus-rich; more drought tolerant than most ferns
1–3ft tall , 1–3ft wide
Semi-Deciduous
Resistant
Friendly
Pacific Coast from Washington to Baja California
Non-flowering; reproduces by spores
Most drought tolerant native fern; excellent for dry shade under oaks
Care Guide
Planting
Plant your Coastal Wood Fern in part shade to full shade in fall or early spring. It prefers well-drained, humus-rich soil and is more drought tolerant than most ferns, so amend your planting area with compost to improve drainage and organic matter. Space plants 1.5 to 3 feet apart depending on whether you want them to fill in as a groundcover or grow as individual specimens. This fern works well in containers too, if you prefer that option.
After Planting
Water weekly during your first summer to establish the plant, then transition to low water once it's established - this fern is tougher than typical ferns and won't need constant moisture. Expect semi-deciduous behavior, meaning some fronds may die back depending on the year, so don't panic if it looks sparse in winter. The biggest mistake Bay Area gardeners make is overwatering; let the soil dry out between waterings rather than keeping it constantly soggy. Minimal pruning is needed; just remove dead or damaged fronds as needed.
Wildlife Supported
Amphibians
Shelters beneath and within frond bases in moist woodland understory
Refugium in leaf litter and under fern fronds
Birds
Dense fern cover provides roosting and foraging habitat during cooler months
Fern understory habitat for foraging on invertebrates
Mammals
Dense frond cover provides nesting and foraging protection
Woodland understory cover for foraging and refuge
Insects
Larvae develop on fern foliage in warmer months
Larvae feed on fern fronds during active growth period
Reptiles
Basking and foraging microhabitat among fern fronds during warm months