Blechnum penna-marina | Alpine Water Fern

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DESCRIPTION
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.

DESCRIPTION
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.

  • Family: Blechnaceae
    Height: 12 to 24 inches
    Width: 12 to 18 inches
    Foliage color: Dark green
    Flower color: Not applicable; ferns do not produce flowers
    Bloom time: Not applicable; ferns reproduce via spores
    Light requirements: Partial shade to full shade
    Water requirements: Moderate
    Maintenance: Low; minimal care needed
    Growing zone: USDA Zones 5 to 9
    Wildlife attractors: Attracts beneficial insects, and provides habitat for small wildlife

    This plant can be seen at the Center for Urban Horticulture.

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  • 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.