Description of Peltandra undulata (Green Arrow Arum)

Peltandra undulata is green arrow arum, a North American marginal with glossy arrow-shaped leaves. It’s grown mainly for foliage, and it gives you a bold leaf shape without taking up the space of butterbur or skunk cabbage.

Appearance

Leaves are upright, deep green, and arrow-shaped, often with a slightly wavy edge. It forms a clump and can reach around 30 to 60cm tall. Flowers are arum-like and not the main feature, but they can appear in summer.

Care Guide

It wants constant moisture and it does best as a true marginal in shallow water or saturated soil.

• Sun: Full sun to part shade.
• Soil: Aquatic compost in a basket, topped with gravel.
• Water depth: Shallow water, often 5 to 20cm over the soil line.
• Feeding: A spring feed helps in baskets.
• Tidy up: Remove damaged leaves and cut back in late autumn.

It can be slow to establish, so keep it warm and wet through its first growing season.

Suitability for Bog Garden

This suits bog gardens that include a pond shelf or permanently wet zone. It’s useful where you want clean foliage at mid height, especially near paths and viewing points.

It pairs well with flowering spikes like pickerel weed and loosestrife, because the leaf shape breaks up all the vertical lines.

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