Northwest Blooms · Groundcovers
Blechnum penna-marina
Alpine Water Fern
- Family
- Blechnaceae
- Height
- 12 to 24 inches
- Width
- 12 to 18 inches
- Flower color
- Not applicable; ferns do not produce flowers
- Foliage color
- Dark green
- Bloom time
- Not applicable; ferns reproduce via spores
- Light
- Partial shade to full shade
- Water
- Moderate
- Maintenance
- Low; minimal care needed
- Growing zone
- USDA Zones 5 to 9
- Wildlife
- Attracts beneficial insects, and provides habitat for small wildlife
About this plant
Blechnum penna-marina, commonly known as the alpine water fern, is a delicate and attractive fern native to the cooler regions of the Southern Hemisphere, particularly found in New Zealand, Tasmania, and parts of South America. This fern is characterized by its lush, feathery fronds that can create a beautiful, textured ground cover in shaded or partially shaded areas. During the colder months, the fronds may exhibit slight color changes, occasionally developing a rusty bronze or reddish hue. This color shift can add a subtle warmth to the landscape, especially during fall or winter.
This fern thrives in moist environments, often found in alpine and subalpine habitats where it can grow among rocks and in wet, shaded woodland areas. Its ability to tolerate cold temperatures and its evergreen nature make it an excellent choice for creating a serene, woodland feel in garden designs.
Works well in
Rock Gardens · Woodland Gardens · Borders · Deer-Prone Areas
Companion plants
Hellebores · Japanese forest grasses · Primroses · Astilbes · Ligularia · Creeping Jenny
Design tip
Use this fern to connect separate planting groups by carrying its fine texture through shaded areas of the garden. Repeating the graceful fronds creates visual flow, making individual beds feel like parts of one cohesive woodland landscape.
Where to see it
This plant can be seen at the Center for Urban Horticulture.
