Propagating Water Sprite by Adventitious Plantlets

Water sprite is a fast aquatic fern that grows adventitious plantlets on its leaf margins. Learn to detach rooted plantlets and split clumps by division.

Overview

Water sprite, Ceratopteris thalictroides 'Water Sprite', is an aquatic fern of the family Pteridaceae that usually grows quickly and can reach full maturity in around 29 days. It has air-filled, spongy stems and lacy fronds, and it can function both as a floating plant and as a rooted substrate plant. It is a beginner-friendly fern that makes excellent fry shelter and a strong nitrate exporter.

Propagation Method (Adventitious Plantlets)

Water sprite reproduces vegetatively through small adventitious plantlets that grow on the mother plant and are released when ready. These plantlets form along the margins of mature leaves, develop their own fronds and roots, and eventually detach to become independent plants. You can let them drop naturally or remove them once rooted; dividing a large clump is a quick secondary method.

Step-by-Step

1. Inspect mature fronds for small plantlets forming along the leaf margins.
2. Wait until each plantlet has its own little fronds and visible roots.
3. Detach the rooted plantlet, or collect the ones the plant releases on its own.
4. Either let the plantlet float at the surface or anchor its roots gently in the substrate.
5. To divide instead, split a large clump into sections that each keep roots and fronds.
6. Grow the young plants on; expect rapid filling-in given the fast growth rate.

Conditions for Healthy Growth

Water sprite does well in medium light and a temperature of 22-28 C, with pH 6-7.5 and GH 3-14; it benefits from higher light and added CO2 but does not require CO2. It grows in any substrate or floating, and can also grow emersed.

• Lighting: medium (higher light boosts growth)
• Temperature: 22-28 C
• pH: 6-7.5, GH: 3-14
• Substrate: any (or floating)
• CO2: not required (benefits from it)

Maintenance

Because growth is fast, trim and thin water sprite roughly every ten days to keep it from overtaking the tank and shading other plants. Skim off surplus floating plantlets, remove yellowing fronds at the base, and harvest excess growth to keep nutrient export in balance.

Common Challenges

• Rapid growth can quickly shade out slower plants if left untrimmed.
• Plantlets removed before rooting may take longer to establish.
• Floating mats can block surface light and gas exchange when overgrown.