Propagating Cryptocoryne undulata

How to propagate the wavy-leaved Cryptocoryne undulata through runners and side shoots plus rhizome division, and how to manage crypt melt on this hardy root feeder.

Overview

Cryptocoryne undulata is a rosette crypt from the family Araceae, known for its long, ruffled dark green leaves that can grow to more than 35 cm when mature. It is found in Sri Lanka and Thailand, grows well partially and fully submersed, and flowers relatively easily, making it one of the more forgiving crypts for new aquarists.

Like other crypts, it is a rosette plant that feeds from the substrate, so propagation goes hand in hand with good root nutrition.

Propagation Method

The diploid form of C. undulata reproduces vegetatively by forming runners. As with other crypts, an established clump can also be divided through the rhizome, giving you two complementary ways to multiply the plant.

• Runners and side shoots: the diploid form forms runners that grow into new plants.
• Rhizome division: split a mature clump into rooted sections.

Step-by-Step

1. Grow the parent in nutrient-rich substrate until the diploid form sends out runners or builds a dense clump.
2. For runners, wait until the plantlet has its own roots and leaves, then cut the runner free.
3. For division, gently lift a mature clump and separate the rhizome into rooted sections.
4. Replant each new plant with the roots buried and the crown left above the substrate.
5. Press root tabs into the substrate near each plant, since crypts feed from the roots.

Conditions for Healthy Growth

C. undulata is very tolerant of low light, though it appreciates a temperature range of roughly 22-28 degrees C. Provide a nutrient-rich substrate and stable water, since crypts dislike abrupt changes.

• Substrate: nutrient-rich with root tabs.
• Light: low light is well tolerated.
• Temperature: warm, around 22-28 degrees C.

Maintenance

Bury the roots while keeping the crown above the substrate. Replenish root tabs as they deplete, and let settled plants spread undisturbed so runners can fill in the midground.

Common Challenges

• Crypt melt: crypts are sensitive to major water changes and may absorb their leaves while adjusting. With healthy roots and no further moving, new shoots usually return within a few weeks.
• Runners cut before the plantlet has roots.
• Weak growth from depleted substrate — add root tabs.