Propagating Hydrocotyle verticillata: Dividing the Creeping Rhizome

Whorled pennywort spreads by a creeping rhizome along the substrate. Learn to divide and replant rooted shoots for a fast-filling, low-maintenance foreground carpet.

Overview

Hydrocotyle verticillata, the whorled pennywort, is a creeping foreground plant native to South and North America and the West Indies, where it grows in marshy, boggy and wet places. It has a trailing, creeping habit rather than upright growth and stays low, making it a classic foreground choice for planted tanks and garden ponds.

Propagation Method

Whorled pennywort multiplies through its creeping rhizome, which sends out shoots and roots as it travels across the substrate. To propagate, separate a rooted section of the creeping rhizome from the parent and replant it. Each portion that carries its own roots can become an independent plant.

Step-by-Step

Let the plant spread along the substrate until the creeping rhizome carries several rooted shoots.
Trace a healthy length of rhizome that bears its own roots and leaves.
Cut or gently separate that rooted section from the mother plant.
Replant the division in the substrate, or float it, since the plant does not strictly need to be rooted.
Space divisions across the foreground so they knit together into a low mat.

Conditions for Healthy Growth

Hydrocotyle verticillata is undemanding but performs best with strong light and soft, slightly acidic water; it benefits from additional carbon dioxide and a good substrate. It can grow submersed, emersed or marginal, and even thrives as an indoor plant when the soil stays moist. Expect heights of roughly 3–10 cm at a medium growth rate.

Maintenance

Because it spreads laterally by rhizome, trim and thin it periodically to keep the carpet tidy and stop it from creeping into neighbours. Replant trimmed rooted pieces to thicken bare spots, and remove any older or damaged leaves to keep the stand fresh.

Common Challenges

In dim light the plant tends to grow tall and sparse instead of forming a tight foreground. Insufficient CO2 or a poor substrate slows the creeping rhizome and weakens the carpet. Because it can also grow as a floating plant, loose unrooted pieces may drift; anchor divisions until their roots take hold.