Cryptocoryne Undulata (Cryptocoryne undulata) Care Guide
A medium-sized Cryptocoryne with elegantly wavy leaf edges that add movement and texture to the midground.
Compiled by Aquairi from published sources · Published · Updated
Overview
Cryptocoryne undulata is an aquatic plant in the family Araceae. A medium-sized Cryptocoryne with elegantly wavy leaf edges that add movement and texture to the midground. Very tolerant of low-light conditions and one of the most forgiving Cryptocoryne species for beginners.
Taxonomy
- Family: Araceae
- Genus: Cryptocoryne
- Scientific name: Cryptocoryne undulata
- Other names: Undulate Crypt
Habitat
Endemic to Sri Lanka, where it inhabits shaded streams in the central and southern parts of the island. Often treated as Cryptocoryne undulatus in modern literature. Hardy and tolerant of variable water parameters.
Growth requirements
- Light: low (≈30-50 PAR at substrate)
- CO2: optional (CO2 improves growth and coloration)
- Temperature: 22-28 °C
- pH: 6-7.5
- GH: 2-15 °dGH
- Substrate: nutrient-rich aquasoil or fertilised gravel
- Nutrient demand: low
- Growth rate: slow
- Difficulty: beginner
Placement
- Recommended placement: midground
- Maximum height: 20 cm
Propagation
In cultivation the plant is propagated by runners (daughter plants on horizontal stolons).
Propagating Cryptocoryne undulata
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
- Grow the parent in nutrient-rich substrate until the diploid form sends out runners or builds a dense clump.
- For runners, wait until the plantlet has its own roots and leaves, then cut the runner free.
- For division, gently lift a mature clump and separate the rhizome into rooted sections.
- Replant each new plant with the roots buried and the crown left above the substrate.
- 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.
Propagating Cryptocoryne undulata 'Broad Leaves' by Runners and Division
Overview
Cryptocoryne undulata is a hardy rosette crypt found in Sri Lanka and Thailand. The 'Broad Leaves' variant carries broader, strongly wavy leaves; mature plants of the species can grow long, ruffled dark green leaves to more than 35 cm. It is considered one of the easier cryptocorynes to grow and is common in the aquarium trade.
It prefers bright light and a temperature range of 22-28 °C (72-82 °F), grows well both partially and fully submersed, and flowers relatively easily — a good sign of a settled, healthy plant ready to propagate.
Propagation Method (Runners / Division)
Cryptocoryne undulata propagates vegetatively: the 'diploid' form forms runners. These runners travel through the substrate and push up new daughter plants a short distance from the mother. A mature clump's rhizome can also be divided into sections, each with roots and leaves, to make additional plants.
Step-by-Step
- Let a mother plant establish firmly in nutrient-rich substrate and grow undisturbed.
- Watch for runners pushing up daughter plants nearby; let each develop its own leaves and roots.
- To divide, lift a mature clump and cut the rhizome into sections, keeping roots and several leaves on each.
- Replant the runner offsets or rhizome divisions into the substrate, burying the roots but keeping the crown exposed.
- If leaves melt after replanting, leave the rhizome in place and wait — new growth typically follows.
Conditions for Healthy Growth
- Temperature: 22-28 °C suits it well.
- Lighting: it prefers bright light; lower light produces lighter green foliage.
- Substrate: nutrient-rich; as a root feeder it benefits from feeding through the roots.
- Growth form: thrives both partially and fully submersed.
Maintenance
Once established, the broad-leaf crypt needs little attention. Remove fully melted or rotting leaves so they do not foul the water, and thin runner offspring if the midground becomes crowded.
Common Challenges
The classic challenge is crypt melt triggered by transplanting or parameter changes. Resist the urge to uproot a melting plant — the rhizome usually recovers. Pale, lighter foliage points to insufficient light rather than disease.