Propagating Dwarf Water Clover (Marsilea crenata)
How to propagate the carpeting fern Marsilea crenata by creeping runners and division, with conditions, maintenance, and why its leaf form changes with light.
Overview
Marsilea crenata, the dwarf water clover, is a small aquatic fern in the family Marsileaceae, native to Southeast Asia. In the wild it grows in muddy, wet places such as rice fields, shallow puddles, and ditches, and looks like a four-leaf clover. Its leaf form depends on conditions: floating in deep water, erect in shallow water or on land.
In the aquarium it is a hardy, forgiving carpeting plant. Small bundles spread across the substrate by offshoots to form a dense, low carpet only 1-3 cm tall.
Propagation Method
Marsilea is propagated by its creeping rhizome and runners: an established mat sends out offshoots that root into the substrate. To multiply it, simply divide the carpet into smaller bundles and replant them, where they spread outward on their own.
Step-by-Step
- Let the planted mat establish and start sending out offshoots across the substrate.
- Lift a portion of the carpet, keeping the creeping rhizome and roots intact.
- Separate it into small bundles, each with leaves and a piece of rhizome.
- Replant each bundle pushed gently into the substrate a few centimeters apart.
- Let the bundles spread and knit together into a continuous carpet.
Conditions for Healthy Growth
It has a medium light demand but tolerates poorer light, and needs only low CO2. A nutrient-rich substrate or root tabs supports the best carpet. Warm water (around 20-28 C) and a pH near 6.0-7.5 suit it. Growth is on the slow-to-medium side.
Maintenance
Trim the carpet periodically so it does not grow too thick and shade its own lower leaves. In medium to high light it stays short and needs little trimming; trimmings of rooted runners can be replanted to fill gaps.
Common Challenges
Slow early growth and poor anchoring are the main hurdles. Plant small bundles, give it a nutrient-rich base, and be patient while it spreads.