Propagating Cryptocoryne cordata

How to propagate the rosette crypt Cryptocoryne cordata by runners and rhizome division, plus conditions, maintenance, and managing crypt melt after planting.

Overview

Cryptocoryne cordata is a broad-leaved crypt in the family Araceae, native to Southeast Asia. Like other Cryptocoryne species it is a rosette plant that grows from a crown and rhizome and feeds heavily through its roots.

Crypts are root feeders: they require substrate and grow best with root tabs and a nutrient-rich base. C. cordata is a slow but rewarding low-light specimen for the midground.

Propagation Method

Cryptocoryne propagates by runners and rhizome division. An adult plant sends out runners into the surrounding substrate, where plantlets develop. The plantlets grow faster if left attached to the mother plant; once they reach a leaf size of about 5-6 cm, the runners can be cut and the daughter plants transplanted.

Step-by-Step

Let the parent plant establish so it begins sending runners through the substrate.
Leave plantlets attached to the mother until their leaves reach roughly 5-6 cm.
Cut the runner to separate each daughter plant with its own roots.
Alternatively, lift the parent and divide the rhizome, keeping a crown and roots on each piece.
Replant divisions burying the roots but keeping the crown above the substrate; add a root tab nearby.

Conditions for Healthy Growth

C. cordata is an easy low-light plant that does not require CO2. It prefers warm water (around 22-28 C), a pH near 6.0-7.5, and tolerates a wide GH range. The key to vigor is a nutrient-rich substrate plus root tabs feeding the roots.

Maintenance

Maintenance is minimal: replenish root tabs periodically and remove old or damaged leaves at the base. Avoid frequent uprooting, since crypts dislike major disturbance and respond by melting.

Common Challenges

If melt occurs, some growers trim the melted emersed leaves so the plant focuses energy on new submersed growth. Keep conditions stable to minimize melting.