Hydroponic Cryptocoryne: Growing Crypts Above the Water Line
Hydroponic cryptocoryne is a crypt grown emersed, with its roots in water or wet inert media and its leaves in humid air. Growers often raise crypts this way in covered jars or trays.
The short answer
Growing hydroponic cryptocoryne means raising crypts emersed in a covered jar or tray. UF/IFAS notes emergent aquatic plants need very little water but more space above it. Use inert media, set water just below the crown, give bright light plus change the solution every 2 to 3 weeks.
Can cryptocoryne grow out of water?
UF/IFAS sorts aquatic plants into submersed, emergent, floating leaved plus floating types. Emergent plants form most of their leaves above the water. UF/IFAS lists Cryptocoryne among plants that spread by runners, which producers clip to start new pots. Crypts sold in sealed jars often come from tissue culture, which UF/IFAS notes gives hardier starter plants.
What setup suits emersed cryptocoryne?
A clear jar or shallow tray under a loose cover traps humid air around the leaves. UC Master Gardeners note many hydroponic systems use an inert medium such as coconut coir, perlite or vermiculite to support roots. Add water to just below the crown.
| Factor | Target | Tip |
|---|---|---|
| Water depth | Very little water, about 2 inches for emergent plants | Leaves grow above the surface (UF/IFAS) |
| Light | Significant light for tropical plants | Add a lamp indoors (UF/IFAS plus UC) |
| Media | Inert coir, perlite or vermiculite | Supports roots (UC Master Gardeners) |
| Solution | Replace every 2 to 3 weeks | Mix at the stated rate (Illinois) |
| Nutrients | Low | Avoid overfeeding to limit algae (UF/IFAS) |
Source: UF/IFAS Extension, UC Master Gardeners of Orange County plus University of Illinois Extension.
How much light does emersed cryptocoryne need?
UF/IFAS notes most freshwater ornamental aquatic plants are tropical plus need a warm climate with significant light. UC Master Gardeners note that with lighting, plants can grow indoors all year. Set the jar under a grow light or in a bright window away from hot direct sun.
How to: step by step
- Buy a vigorous cryptocoryne from a plant shop.
- Rinse the roots plus snip mushy parts.
- Set the plant in a jar or tray of inert media.
- Fill with clean water to just below the crown.
- Cover loosely to trap humidity.
- Place under a bright light plus top up water weekly.
Troubleshooting
Leaves die back after the move: the plant is adjusting. Trim soft leaves plus wait for new emersed growth.
Slimy roots: stale water. Change the solution plus rinse the media, per Illinois Extension timing.
Browning leaf edges: dry air. Replace the cover.
Green film on jar walls: algae. UF/IFAS notes high nutrients feed algae, so feed less.
For more on soilless growing read hydroponic in different mediums plus caring for your hydroponic system. Water quality notes are in aquarium water for cannabis. Kind Seed Co also stocks cannabis seeds.
Sources
- Freshwater ornamental aquatic plant production in Florida (FA251), UF/IFAS Extension
- Water gardens: planting aquatic plants (PlantTalk 1026), Colorado State University Extension
- Hydroponics for the home gardener, UC Master Gardeners of Orange County
- Home hydroponics handouts, University of Illinois Extension
FAQ
How much water does an emersed plant need?
UF/IFAS notes emergent aquatic plants need very little water, about 2 inches, but need more space above the surface because most leaves form in the air. CSU Extension notes most marginal plants grow well with 1 to 4 inches of water over the crown.
Can cryptocoryne be divided?
UF/IFAS lists Cryptocoryne among plants that make runners with daughter plants along them. Producers clip the daughters from the parent plus plant them in new pots. UF/IFAS advises leaving roots intact when moving them, since new plants can come loose from the media easily.
Does emersed cryptocoryne need fertilizer?
UF/IFAS notes some species need added fertilizer. It also notes high nutrient levels feed algae, so use a light hand.
How often should the water be changed?
University of Illinois Extension advises replacing the nutrient solution every 2 to 3 weeks in home hydroponic systems. Between changes UC Master Gardeners advise checking the water level, nutrient levels plus pH, since a root problem can spread quickly through a shared solution.
What should be done with trimmings?
UF/IFAS notes some non native aquatic plants are invasive because they spread in the wild. Put trimmings in the trash or compost. Never drop them in ponds, ditches or streams.
