Bog arum

Bog arum (Calla palustris) is a perennial herbaceous plant belonging to the Araceae family. It is a true hydrophyte that thrives in wet, saturated environments such as marshes, fens, and the muddy banks of slow-moving water bodies, acting as an essential component of wetland ecosystems.

The native range of this species extends throughout the temperate and subarctic regions of the Northern Hemisphere, including large parts of Europe, Asia, and North America. Its adaptability to cold climates makes it a staple for water gardening in regions where more tropical varieties of Araceae would struggle to survive the winter.

Botanically, the plant features a creeping, branching rhizome and cordate (heart-shaped) foliage. The inflorescence consists of a fleshy spadix surrounded by a prominent, pure white spathe. Following the flowering phase, the plant produces clusters of vibrant red berries, which add significant aesthetic interest to a pond or bog garden during late summer.

In terms of cultivation, Bog arum requires moist, humus-rich soil and can be grown either in shallow water (up to 20 cm deep) or in constantly soggy, boggy soil. It prefers semi-shaded areas, as direct scorching sunlight can cause leaf burn during the peak of summer. Propagation is effectively achieved by division of the rhizomes in the spring.

While the plant is considered toxic if consumed raw due to the presence of calcium oxalate crystals, it is widely utilized for its ornamental value and water-purifying capabilities. It helps manage nutrient levels in small ponds and provides cover for aquatic invertebrates. Due to its hardiness and ease of care, it is a low-maintenance choice for naturalistic water-feature designs.

• Excellent winter hardiness (USDA Zones 3-8).
• Suitable for both bog gardens and submerged containers.
• Low susceptibility to common greenhouse pests.
• Provides excellent shelter for pond life.