Care Guide
Cryptocoryne Care Guide
Cryptocoryne are slow-growing rosette plants that do well in low to moderate light without injected CO2. Plant them with the roots buried and the crown at the substrate surface, feed the roots with a rich substrate or root tabs, then leave them in place. Many melt after planting, but the roots usually regrow leaves within a few weeks.
Understanding Cryptocoryne Plants
Cryptocoryne, often called crypts, are rooted plants from streams and swamps in South and Southeast Asia. Dozens of species and varieties are kept, from small foreground plants such as Cryptocoryne parva to tall background plants such as Cryptocoryne balansae, in green, brown, bronze and pink shades.
They grow slowly and form clumps from a short rhizome. Once established they are among the most dependable plants for low-tech tanks.
Planting Cryptocoryne Correctly
Remove pots and rock wool, separate the plants gently, and trim very long or damaged roots. Push the roots into the substrate so the crown, where leaves meet roots, sits at the surface rather than buried deep.
Space plants a few centimetres apart to allow runners to spread. Small species suit the foreground, medium ones the midground, and tall species the back.
Lighting and Placement
Most crypts grow well in low to moderate light and tolerate shade under taller plants or floating plants. Strong light can bring out red and brown tones in some varieties but is not necessary.
Injected CO2 speeds growth but is not required. Place crypts where they will not need to be moved, because they dislike being disturbed.
Substrate and Nutrient Needs
Crypts take much of their food through their roots. A nutrient-rich aquasoil, or an inert sand or gravel with root tabs placed near the plants every few months, supports steady growth.
A balanced liquid fertiliser also helps, especially iron and potassium. Pale new leaves or very slow growth after the plant has settled usually point to a lack of nutrients in the root zone.
Crypt Melt and Recovery
Crypt melt is when leaves turn transparent, soften and rot away, often within days. It usually follows a change in conditions, such as moving from a farm’s emersed growth to underwater life, or a big change in light, temperature, CO2 or water chemistry.
Do not pull the plant out. Remove the melting leaves so they do not foul the water, keep conditions stable and leave the roots in place. New leaves adapted to the tank usually appear within a few weeks.
Growth and Propagation
Healthy crypts spread through runners that send up new plants nearby. Over time a single plant becomes a dense clump.
To divide a clump, wait until the plants are established, then gently separate a young plant with its own roots and replant it. Splitting too often slows the whole group.
Long-Term Cryptocoryne Care
Once settled, crypts need little care. Remove old or damaged leaves at the base, refresh root tabs on schedule, and keep conditions steady.
Avoid uprooting or moving them repeatedly, as each move can trigger another melt. Vacuum lightly around them rather than digging into the root mat.
Frequently Asked Questions
Do Cryptocoryne Plants Need CO2?
No. Cryptocoryne grow well without injected CO2. CO2 speeds their growth, but most low-tech tanks with moderate light and a good substrate grow them well.
What Causes Crypt Melt?
A change in conditions, most often the move from emersed farm growth to underwater life, or a sudden change in light, temperature, CO2 or water chemistry. The plant sheds leaves that no longer suit the new conditions.
Will Cryptocoryne Grow Back After Melting?
Usually, yes. If the roots and rhizome are healthy, new leaves normally appear within a few weeks. Remove rotting leaves, leave the plant in place and keep conditions stable.
Do Crypts Need Root Tabs?
They benefit greatly from them unless the tank uses a nutrient-rich aquasoil. In sand or plain gravel, place root tabs near the plants every few months.
How Much Light Do Cryptocoryne Need?
Low to moderate light is enough for most species. They tolerate shade, and strong light is only useful for bringing out red and brown colours in some varieties.
How Do Cryptocoryne Spread?
Through runners that grow under the substrate and send up new plants nearby. Over time a single plant forms a clump that can be divided.
Can Cryptocoryne Grow in Gravel?
Yes, if the gravel is fine enough for the roots to anchor and you add root tabs, because plain gravel provides almost no nutrients.
Cryptocoryne Mioya
Cryptocoryne wendtii 'Mioya'
- Care level
- Beginner
- Placement
- Foreground, Midground
- Light
- Low, Medium
- CO₂
- Optional
Cryptocoryne Nurii
Cryptocoryne nurii
- Care level
- Specialist
- Placement
- Foreground, Midground
- Light
- Medium
- CO₂
- Optional
Cryptocoryne Yujii
Cryptocoryne yujii
- Care level
- Specialist
- Placement
- Foreground, Midground
- Light
- Medium
- CO₂
- Optional
Cryptocoryne Parva
Cryptocoryne parva
- Care level
- Intermediate
- Placement
- Foreground
- Light
- Low, Medium
- CO₂
- Optional