Peltandra undulata (Green arrow arum) - Marginal Pond Plants - MP087

Peltandra undulata, commonly known as Green Arrow Arum, is a striking perennial aquatic plant native to North America. It thrives in wetland environments such as marshes, streambanks, and pond margins. Known for its arrow-shaped leaves and tolerance for wet conditions, Peltandra undulata is an excellent choice for water gardens, bog gardens, and naturalized wetland landscapes.

Description

Peltandra undulata grows to a height of 60–100 cm (24–40 inches) and forms dense clumps of upright, arrowhead-shaped leaves. The foliage is glossy green, with a slightly wavy or undulating edge, giving the plant its characteristic texture and ornamental appeal. The leaves are borne on long, sturdy stems that emerge directly from the rhizomes.

In summer (June to August), Green Arrow Arum produces subtle, greenish flowers that consist of a cylindrical spadix surrounded by a pale green spathe. While not particularly showy, the flowers add a unique structural element to the plant. These are followed by small, berry-like fruits that develop inside the spathe, adding further interest.

Growing Conditions

Peltandra undulata thrives in full sun to partial shade and prefers consistently wet or waterlogged soil. It is ideal for planting in shallow water up to 15 cm (6 inches) deep or along the edges of ponds, streams, and wetlands. The plant grows well in a range of soil types, including clay, loam, and sandy soils, and performs best in nutrient-rich, slightly acidic to neutral pH conditions.

This plant is hardy in the UK and can tolerate frost, regrowing in spring after winter dormancy. It is suitable for both naturalistic and formal water garden designs.

Propagation and Care

Peltandra undulata is propagated by division or seed. Division is the most reliable method and can be done in early spring or autumn by separating clumps of rhizomes and replanting them in suitable wet conditions. Seeds can also be sown in moist soil during spring, but germination may take longer.

Once established, this plant is low-maintenance. It requires consistent moisture and thrives in waterlogged conditions. Occasional thinning or division may be needed to prevent overcrowding and maintain plant health. Deadheading spent flowers and trimming damaged or yellowing leaves will help keep the plant looking tidy.

Uses

Ornamental:

Peltandra undulata is a beautiful addition to water gardens, pond edges, and wetland landscapes. Its lush foliage and upright growth habit add texture and structure to aquatic plantings. It pairs well with other moisture-loving plants, such as Iris pseudacorus (Yellow Flag Iris), Pontederia cordata (Pickerel Weed), and Typha minima (Dwarf Cattail).

Erosion Control:

The plant’s dense root system helps stabilize soil along water margins, reducing erosion and protecting the integrity of streambanks and pond edges.

Naturalized Planting:

This species is ideal for creating naturalized wetland habitats where its dense growth provides habitat and shelter for aquatic wildlife.

Ecological Value

Green Arrow Arum contributes to wetland biodiversity by providing food and shelter for various wildlife. The plant’s flowers attract pollinators such as bees and flies, while its dense foliage offers cover for small aquatic creatures, insects, and amphibians. The berries are eaten by birds, aiding seed dispersal.

Additionally, the plant improves water quality by filtering sediments and absorbing excess nutrients, reducing the risk of algae blooms and promoting healthier aquatic ecosystems.

Considerations

• Moisture Needs: Peltandra undulata requires consistently wet conditions and is not suitable for dry or well-drained areas.
• Spread Management: While not aggressively invasive, the plant may spread in optimal conditions. Regular thinning can help manage its growth.
• Winter Dormancy: The plant dies back in winter, with new growth emerging in spring.

Summary

With its bold arrow-shaped leaves, upright growth habit, and ability to thrive in wet conditions, Peltandra undulata is a valuable addition to water gardens, bog gardens, and wetland landscapes. Its ecological benefits, ease of care, and ornamental appeal make it a versatile plant for enhancing the beauty and biodiversity of aquatic environments. Whether used as a focal point or as part of a mixed planting scheme, Green Arrow Arum is an excellent choice for creating vibrant and functional water features.

Why Choose Peltandra undulata (Green Arrow Arum)?

Peltandra undulata, commonly known as Green Arrow Arum, is a hardy aquatic perennial that thrives in wetland environments and shallow water. Known for its striking arrow-shaped leaves and distinctive white spathes, this plant adds both texture and elegance to pond edges, bog gardens, and marshy landscapes. Its ability to grow in damp conditions and its bold foliage make it an excellent choice for creating a unique and dramatic focal point in water gardens.

1. Arrow-Shaped Green Leaves

• Peltandra undulata features large, glossy green leaves that are arrow-shaped with slightly undulated edges.
• The leaves can grow up to 30 cm (12 inches) in length, creating a bold, dramatic look in any wetland garden or aquatic landscape.
• The arrow-shaped foliage adds texture and structure, complementing other aquatic plants and creating a lush backdrop in your garden.

2. Unique White Spathes

• Produces white, hood-like spathes that surround a yellow spadix, similar to the appearance of an arum lily.
• The spathe provides a striking visual contrast to the green foliage, making the plant stand out in the garden.
• Green Arrow Arum flowers in late spring to early summer, offering a bright burst of white in wetland or pond gardens.

3. Thrives in Wet and Moist Conditions

• Peltandra undulata thrives in moist to wet soil or shallow water (up to 20–30 cm / 8–12 inches deep), making it ideal for planting along pond edges, in bog gardens, or in wet meadows.
• Performs well in full sun to partial shade, providing flexibility for various wetland environments while ensuring healthy growth and vibrant foliage.

4. Hardy and Low Maintenance

• Green Arrow Arum is a hardy perennial that is adaptable to fluctuating water levels and varying moisture conditions, making it perfect for wetland areas and water gardens.
• Once established, it requires minimal care, making it a low-maintenance addition to your aquatic or garden space.

5. Wildlife-Friendly

• The white spathes and yellow spadix attract pollinators, including bees and butterflies, helping to promote a healthy ecosystem in your garden.
• The dense foliage provides shelter for small creatures like amphibians and insects, contributing to the overall biodiversity of your wetland or pond garden.

6. Erosion Control and Water Filtration

• The plant’s dense root system helps stabilize soil, making it excellent for erosion control along pond banks, marshes, and wetland areas.
• Peltandra undulata also helps to filter water, absorbing excess nutrients and improving water quality in your aquatic garden.

7. Versatile Design Use

• Ideal for water gardens, bog gardens, pond edges, or wetland landscapes, where it can provide both texture and elegance.
• Works well in naturalistic plantings, where its arrow-shaped leaves create a lush, tropical appearance, or in wildlife gardens to support pollinators and small creatures.

Key Features

• Height: 30–60 cm (12–24 inches)
• Flowers: White spathes with yellow spadix, blooming in late spring to early summer
• Soil: Moist to wet soil or shallow water
• Light: Full sun to partial shade

Peltandra undulata (Green Arrow Arum) is a striking and functional addition to any water garden or wetland landscape. Its dramatic arrow-shaped foliage, unique white flowers, and ability to thrive in wet conditions make it an excellent choice for enhancing the beauty and ecological health of your aquatic garden.