Quick answer: Fittonia thrives at 70–90% humidity, 20–27°C and medium, indirect LED light. Plant it in a free-draining tropical soil, keep the soil evenly moist but never waterlogged, and pinch the growing tips every few weeks so it stays bushy. If it suddenly collapses, it's almost always thirsty or dried out by air, and it usually perks up within hours of a drink and a mist.
What is fittonia?
Fittonia (Fittonia albivenis, also sold as F. verschaffeltii and F. argyroneura) is a low, creeping plant from the rainforest floor of Peru, Colombia and Brazil. Its common names, nerve plant and mosaic plant, come from the bright net of veins across every leaf. In nature it grows in the shade of taller plants, in constantly humid air and on loose, leaf-covered soil. That's almost exactly the conditions inside a well-built tropical vivarium.
Best fittonia varieties for terrariums
| Type | Look | Size | Notes |
|---|---|---|---|
| Mini white / mini red | Small leaves, crisp veins | 5–10 cm tall | The best choice for jars and small closed terrariums |
| Standard pink (e.g. 'Pink Angel', 'Pink Star') | Green leaf, bright pink veins | 10–15 cm | Very popular, good colour under 6,500K LEDs |
| Red veined ('Ruby Red', 'Red Anne') | Leaves heavily washed in red | 10–15 cm | Adds warm colour to cork-heavy builds |
| Silver ('White Anne', 'Frankie') | Silver-white veins | 10–15 cm | Brightens dark corners |
| Giant ('Superba' types) | Large, thick leaves | 15–25 cm | For bigger vivariums; more upright growth |
Where fittonia fits in your build
Use fittonia as foreground and midground ground cover. It looks best in drifts of three to five plants, set between leaf litter and the base of your hardscape, rather than dotted around singly. It pairs well with:
- Cork rounds and flats like our cork partial rounds, which create shaded pockets at the base of the build.
- Moss carpets such as sheet moss or frog moss, which hold humidity right at soil level.
- Leaf litter. Magnolia or almond leaves keep the soil surface damp and give the clean-up crew something to eat.
Fittonia is a classic dart frog plant. The leaves are sturdy enough for small frogs to sit on and low enough to keep the floor shaded and humid. It's also a staple of closed jar terrariums. See our closed jar build guide.
Soil and planting
Fittonia has fine, shallow roots that rot quickly in dense, wet soil. Use an airy, well-draining mix like Jurassic ABG Terrarium Mix, made in Canada by Jurassic Reptile Products, over a layer of clay balls. In a jar without drainage, keep the soil layer shallow (5–7 cm) and water sparingly.
- Remove the plant from its nursery pot and tease away as much peat as you can without tearing the roots.
- Rinse the leaves and roots with dechlorinated water to remove fertiliser residue and hitchhiking pests.
- Split large clumps into smaller plugs of two to three stems. They establish faster and fill gaps more naturally.
- Plant so the crown sits level with the soil surface, not buried. A buried crown is the main cause of stem rot.
- Mist well and leave the lid closed for the first week while the roots settle.
Light
Fittonia is a shade plant, but "shade" inside a terrarium still means meaningful light. Under a typical 6,500K LED bar it does best in the mid and lower parts of the enclosure, 30–50 cm below the light. Too little light makes it stretch, with long gaps between leaf pairs and faded vein colour. Too much direct light, especially near a heat lamp, bleaches and crisps the leaves. If your pink fittonia is turning mostly green, it usually needs a bit more light, not less.
Humidity and watering
This is where fittonia earns its reputation as a "drama queen". It wilts dramatically when dry, sometimes lying completely flat. The good news is that it recovers just as fast. To avoid the cycle:
- Keep ambient humidity at 70–90%. Open-top or heavily screened enclosures are hard on fittonia in dry Canadian homes, especially from November to March.
- Keep the soil evenly moist, like a wrung-out sponge.
- Mist once or twice a day in a tropical vivarium, or rely on a misting system.
- Never let water pool at the base. If the drainage layer is flooded, siphon it out.
Pruning and shaping
Fittonia naturally gets leggy as it matures and will try to flower. The small flower spikes look like little cones. To keep it compact:
- Pinch the top pair of leaves off each stem every 3–4 weeks. Each pinch makes the stem branch into two.
- Remove flower spikes as soon as you see them. Flowering pulls energy from leaf growth and often comes just before a plant gets straggly.
- Pinched tips root easily. Push them straight into moist soil elsewhere in the enclosure to thicken the planting.
Troubleshooting
| Symptom | Likely cause | Fix |
|---|---|---|
| Whole plant collapsed | Dry soil or dry air | Water the base, mist, close the lid. Expect recovery within hours |
| Black, mushy stems at soil level | Crown rot from soggy soil or buried crown | Take healthy tip cuttings and re-root them; improve drainage |
| Brown crispy leaf edges | Low humidity or heat | Reduce ventilation slightly, move it away from the basking lamp |
| Leggy, faded growth | Low light | Increase light or move the plant up; pinch back |
| White fuzz on leaves | Mould from stagnant air | Remove affected leaves, add gentle airflow, let springtails work |
Is fittonia safe for reptiles and amphibians?
Fittonia is generally regarded as non-toxic and is one of the most widely used plants in dart frog, tree frog and small gecko vivariums. Like any plant, it can be trampled by heavy-bodied animals, so it's best suited to frogs, small geckos, inverts and plant-only builds.
FAQ
Can fittonia live in a closed terrarium without airflow?
Yes. It's one of the best plants for fully sealed jars, provided the soil isn't waterlogged. Open the lid for a few minutes once a week if you see condensation that never clears.
Why are my fittonia leaves turning brown?
Browning usually comes from the air drying the leaves out or from cold glass touching them. In winter, leaves pressed against a cold pane can get chilled even when the room feels warm.
How big does fittonia get in a vivarium?
Standard types reach 10–15 cm tall and spread 20–30 cm. Mini types stay under 10 cm.
What should I plant next to fittonia?
Good companions include peperomia, small ferns, mini begonias, live moss and small bromeliads mounted above. Read our peperomia guide and terrarium fern guide.