Genlisea are lovely carnivorous plants that 'hunt' micro-organisms underground. Above ground, the foliage doesn't look particularly exciting, but underground they have complex corkscrew-shaped traps and they often flower beautifully. Although they look delicate, many species aren't too difficult to grow if you meet a few basic requirements.
Substrate
The right substrate is crucial for success with Genlisea. Never use regular potting soil - it contains too many nutrients that will burn the roots.
A standard mix consists of:
- 50% coarse sand (washed, calcium-free)
- 50% sieved peat moss (white peat)
Some growers add perlite for extra drainage, but this is optional. The key is that the substrate must be acidic, nutrient-poor, and well-draining.
Water
Genlisea come from boggy areas and love constant moisture. A great method for me is a tray method which is suitable for most:
- Place the pot in a plastic container/tray
- Keep the water level 1-2 cm below the substrate surface
- Use only rainwater, RO water, or distilled water
- Tap water contains too many minerals and calcium
Tip: Never let the water completely dry out, but also don't keep plants permanently submerged. A cycle where the level fluctuates slightly works best.
Light
Most Genlisea species love lots of light, but not direct midday sun in summer. Ideal conditions:
- Bright, indirect sun or morning/evening sun
- Artificial light: 12-14 hours per day with LED grow lights
- African species generally tolerate more sun than South American ones
Temperature
This depends heavily on the species:
- Tropical species (e.g., G. aurea, G. violacea): 18-28°C, no cold dormancy needed
- African species (e.g., G. africana, G. hispidula): tolerate slightly cooler nights
Avoid temperatures below 10°C unless you specifically know your species can handle it. I personally only have the option to grow them indoors, where it's above 20°C year-round. Time will tell how that works out long-term for the species I have.
Repotting
Genlisea don't need to be repotted often. Only do this when:
- The substrate has broken down (after 2-3 years)
- The plant is outgrowing its pot
- You want to propagate by division
The best time is in spring, just before growth resumes.
Common mistakes
These are the most common problems for beginners:
- Too nutrient-rich substrate - avoid potting soil and fertilizers
- Using tap water - minerals accumulate and kill the plant
- Keeping too dry - Genlisea are bog plants
- Too dark - without enough light they won't flower
In conclusion
With proper care, Genlisea are rewarding plants that will treat you to beautiful flowers. Start with an easy species like G. hispidula or G. violacea and build your collection from there. Good luck!