Fittonia care: keeping a nerve plant from fainting

Light

Bright, indirect light is the target. Missouri Botanical Garden recommends an east or north window, or dappled light, and says to avoid direct sun; NC State says the plant thrives in bright to medium light and does well under fluorescent fixtures. On the University of Illinois Extension scale, that is roughly 150 to 300 foot-candles. Its rainforest-floor origin explains both limits: in deep shade the stems stretch and the veins fade, while direct sun through glass scorches the thin leaves.

Because fittonia handles artificial light so well, a shelf under an LED grow light or a closed terrarium on a desk is a perfectly good home. Watch the top leaves for bleached patches, the first sign that a lamp sits too close or a sunny window is too strong.

Water

Fittonia wants a mix that stays lightly moist all the time. Its roots are shallow, NC State notes, so it lives in a small pot that holds little water and dries quickly in a warm room. Check the surface with a fingertip: as soon as it feels dry, water slowly until it drains from the bottom, then tip out the saucer. NC State goes as far as recommending watering two times a week, which suits a small pot in a warm, bright spot but can be too much in a cool room, so let the feel of the soil decide.

The famous faint is the plant's emergency signal. Stems lose turgor, leaves hang limp and the whole thing looks finished. Water at once, ideally by setting the pot in a bowl of room-temperature water until the surface of the mix darkens, and it usually stands back up within a few hours. Do not make this the routine. Each collapse costs a few lower leaves, which turn crisp and drop over the following days.

The opposite mistake shows more slowly. Missouri Botanical Garden and NC State both read yellowing leaves as a sign of overwatering, and NC State lists root rot among its problems. Soggy mix in a pot without drainage, or a saucer left full, suffocates the fine roots. Moist is right; wet is not.

Soil and pH

Missouri Botanical Garden suggests growing fittonia in a peaty or soil-based potting mixture, and NC State simply asks for well-drained potting soil. A standard peat-based houseplant mix with a small amount of perlite holds moisture between waterings without staying waterlogged. Choose a shallow, small pot with a drainage hole; the roots never need depth, and a large volume of mix stays wet too long.

Humidity

Humidity is where the sources pull in different directions. Missouri Botanical Garden says fittonia prefers high humidity and that withering leaves may signal a need for more, recommending a humidifier, a wet pebble tray or misting. NC State describes medium humidity as enough and adds that leaves may wither if humidity is too high. In practice, dry heated air in winter, which the University of Illinois Extension puts below 30 percent in most homes, is the far more common problem. Grouping plants or using a humidifier helps, and dwarf forms thrive in a terrarium, as long as some air moves and condensation does not sit on the leaves for days.

Temperature

Missouri Botanical Garden says room temperature should always stay above 55°F (13°C), and NC State describes average to cool room temperatures as ideal. Fittonia dislikes drafts in either direction: NC State lists drafts with dry air and direct sun as reasons leaves shrivel and fall. Keep it away from exterior doors, air conditioner outlets and radiators, and off a cold windowsill on winter nights.

Fertilizer

A slow-growing groundcover needs very little food. The University of Illinois Extension recommends feeding most houseplants no more than once every one to three months between March and September with a balanced or 1:2:1 fertilizer at the label rate, and that general rule fits fittonia well. Its small root system in a small pot is easy to burn, so stay at the low end and flush the pot with plain water now and then to clear salts.

Work out the dose for your watering can with the fertilizer dilution calculator →

Repotting

NC State notes that the roots are shallow, so a fittonia can stay in a small pot for a long time. Move it up only when roots fill the pot or the plant starts fainting much sooner after each watering, two of the signs the University of Illinois Extension lists. Spring or early summer is the best time. Go just one size up and keep the planting depth the same, and consider dividing or taking cuttings instead if the plant has become sparse in the middle.

• Water runs straight through and the plant wilts sooner than it used to
• Roots appear on the surface or through the drainage hole
• Creeping stems have rooted over the rim into neighboring pots

Propagation

Stem cuttings are NC State's recommended method, and the creeping stems make it even easier because they root on their own wherever a node touches moist soil. Snip a tip 3 to 6 inches long with at least two nodes, the University of Illinois Extension guideline, strip the lowest pair of leaves, and insert it in damp mix under a clear cover. Tender, juicy stems like these often root within a week. Pinning a trailing stem to a second pot and cutting it free once rooted works too.

Methods: Stem cuttings, Rooted creeping stems (layering) · Best season: spring to summer.

Common problems

Almost every fittonia problem is about moisture, either in the soil or the air. Collapse means thirst; yellow leaves mean the reverse. Shriveling leaves on a plant in moist mix point to dry air, drafts or direct sun, the three causes NC State names. Missouri Botanical Garden and NC State both list mealybugs, scale, spider mites and slugs as pests, and leaf spots as a disease risk. Pinch stem tips to keep the plant dense, and remove the small flower spikes if you want the energy to go to the leaves.

Not sure which one it is? Try the plant problem diagnosis tool →

Is the fittonia toxic to cats and dogs?

The nerve plant is one of the safer choices for a home with animals. The ASPCA lists it under the older name Fittonia verschaffeltii as non-toxic to dogs, cats and horses, and NC State tags it the same way. A cat that chews the leaves may still vomit from the plant material itself, as with any foliage, but no toxic principle is recorded. None of the sources gives a rating for people, so keep it out of reach of toddlers as a matter of habit.

Check any other plant against the ASPCA lists →