The Kangaroo Paw Fern (Microsorum diversifolium) is a popular houseplant, recognized for its distinct, leathery fronds. New plant owners often notice fuzzy, brown structures emerging from the soil or cascading over the pot’s edge. These are commonly, though inaccurately, referred to as “aerial roots.” This article clarifies what these structures truly are and guides on their function and management for a thriving fern.
Understanding Kangaroo Paw Fern Aerial Roots
What appear to be “aerial roots” on a Kangaroo Paw Fern are actually rhizomes. These modified stems grow horizontally, either along the soil surface or slightly above it. They typically have a fuzzy, brownish appearance, sometimes described as dark chocolate colored or hairy. In its natural habitats of Australia and New Zealand, the Kangaroo Paw Fern often grows as an epiphyte, anchoring itself to tree trunks or rocks.
The rhizomes serve multiple functions for the fern, acting as an anchoring mechanism and absorbing moisture and nutrients. They also facilitate the plant’s spread, forming dense clumps. The presence of these creeping, visible rhizomes is a normal aspect of the fern’s growth, indicating a healthy, developing plant.
Care and Management of Aerial Roots
Generally, the visible rhizomes of a Kangaroo Paw Fern do not require specific intervention and are a sign of the plant’s well-being. Attempting to bury them can lead to issues, as they are not true roots and are susceptible to rot if kept consistently wet beneath the soil surface. Instead, allow them to rest on top of the soil or cascade over the pot’s edge.
Unnecessary trimming of healthy rhizomes is not recommended, as it can cause plant stress. However, removing dried or damaged sections can be done carefully to maintain the plant’s appearance. The plumpness and health of the rhizomes reflect the fern’s growing conditions, with firm rhizomes indicating adequate humidity and proper watering. Kangaroo Paw Ferns appreciate consistent soil moisture but do not tolerate soggy conditions, which can lead to root rot.
Propagating Kangaroo Paw Fern Using Aerial Roots
The rhizomes of the Kangaroo Paw Fern are instrumental in its propagation through division, the easiest and most successful method for home gardeners. To propagate, identify a healthy rhizome section with a few fronds. Carefully remove the parent plant from its pot and gently loosen the soil to expose the rhizomes.
Using a clean, sharp, sterilized knife, cut through the rhizome, ensuring each new division has its own set of fronds and some attached roots. The newly separated sections can then be potted into fresh, well-draining potting mix, ensuring the rhizomes are placed on top of the soil, not buried. Keeping the newly potted divisions in a warm location with indirect light and consistent moisture will encourage establishment and new growth.