Propagating Cryptocoryne hudoroi: Runners and Division

A guide to propagating the bullate-leaved Borneo crypt Cryptocoryne hudoroi by runners and rhizome division, with notes on calcium, substrate, and crypt melt.

Overview

Cryptocoryne hudoroi is a rosette crypt from Kalimantan, Borneo, prized by hobbyists for its deeply bullate, textured leaves. It grows in limestone streams, which shapes its preference for calcium. Aquarists report it is one of the bullate-leaved crypts that adapts comparatively well to submerged growth, though detailed cultivation information remains scarce.

Propagation Method (Runners / Division)

Like other Cryptocoryne, C. hudoroi reproduces vegetatively underwater, sending out runners (stolons) through the substrate that each form a daughter plantlet. A mature clump can also be lifted and split at the rhizome into rooted sections. It is commonly grown emersed in commercial culture, where it spreads the same way before being converted to submerged growth.

Step-by-Step

1. Establish the mother plant in calcium-rich, slightly acidic conditions and let it root for at least a month.
2. Wait for runners to push through the substrate and form daughter plantlets with their own roots and several leaves.
3. Sever the runner cleanly between mother and daughter, or lift the clump and divide the rhizome into rooted pieces.
4. Replant each plantlet in aquasoil with added calcium, such as crushed coral, burying roots but leaving the crown exposed.
5. Keep parameters stable and lighting moderate while the new plants settle.
6. Allow roughly 30 days of undisturbed time for the plantlets to root in.

Conditions for Healthy Growth

Reflecting its limestone-stream origin, C. hudoroi does best with adequate calcium and stable, slightly acidic water; aquarists find it grows fairly easily in tap water with plenty of calcium, and recommend adding crushed coral if the water is soft. It is a root feeder that benefits from a rich aquasoil bed under medium light. CO2 is not strictly required but stable conditions matter most.

Maintenance

Remove old or damaged outer leaves at the base and thin the clump by harvesting runners. Avoid frequent uprooting, and keep calcium and pH steady to preserve the prized bullate leaf texture.

Common Challenges

Crypts adapt poorly to transplantation and may need about 30 days to become established, so plan moves carefully. Drops in calcium or swings in pH are common triggers for melt in this limestone-stream species, so prioritize stability.