Fittonia (nerve plant) terrarium care guide

If you’ve ever opened a terrarium build thread on Reddit, you’ve seen fittonia. The veined, colorful leaves are a terrarium staple for good reason: they love humidity, they’re slow enough not to take over, and they come in colors that pop against green moss.

Quick facts

Common names	Nerve plant, mosaic plant, painted net leaf
Botanical name	Fittonia albivenis
Native to	Tropical rainforests of Peru
Light	Low to medium indirect
Humidity	60%+ (perfect for closed terrariums)
Water	Evenly moist, never soggy
Toxic to pets	Non-toxic (ASPCA)
Difficulty	Beginner

Why it’s perfect for terrariums

Fittonia evolved on the floor of Peruvian rainforests — under canopy, in constant humidity, in low light. A closed terrarium is literally recreating its native habitat.

It won’t:

• Outgrow your jar in a season (slow grower)
• Drop leaves from humidity shock (loves humidity)
• Demand bright light (does fine in low light)

It will:

• Add color where everything else is green
• Fill in nicely around moss and ferns
• Tell you clearly when something’s wrong (dramatic fainting, but recovers fast)

The famous fittonia “faint”

The number one thing to know about fittonia: it dramatically wilts when thirsty and recovers within hours of watering.

First-time owners panic when their fittonia looks dead at 6pm. They water it. By morning, it’s perky again. This is not a death — it’s just how fittonia communicates.

Pro tip: In a closed terrarium, you should rarely see a fittonia faint. If it does, your humidity dropped — open lid less, or mist slightly.

Light

Fittonia does best in low to medium indirect light. North-facing windows are ideal. A few feet back from any brighter window works too.

Avoid:

• Direct sun (will bleach and crisp leaves)
• Deep shade (will get leggy and weak)

In an open terrarium in a low-light apartment, fittonia will survive but grow slowly. In a closed terrarium, growth will be a bit faster (more CO2 from the enclosed environment).

Water

In a closed terrarium: almost never needs water. The humidity cycle handles it.

In an open terrarium: water when the top of the substrate feels dry to the touch. Always use distilled or rainwater — fittonia is sensitive to minerals in tap water.

Don’t:

• Let it sit in soggy soil (root rot)
• Let the substrate go bone dry (it’ll faint, repeatedly, until it weakens)

Pruning and shaping

Fittonia grows in a sprawling, slightly leggy way. To keep it tidy:

• Pinch back new growth tips every few weeks — this encourages branching
• Cut at a node (where leaves meet the stem) for clean regrowth
• Don’t cut more than 1/3 of the plant at once

Cuttings are easily propagated — see below.

Propagation

This is where fittonia really pays off. Every time you prune, you have new plants:

1. Cut a 2-3 inch stem just below a node
2. Remove the bottom leaves
3. Stick the stem into moist substrate (or sphagnum)
4. Keep humidity high (a plastic bag over the pot works)
5. Roots in 2–3 weeks

In a closed terrarium, you can just lay cuttings on the substrate and they’ll root wherever they touch. Free plants.

Common problems

Crispy brown leaf edges

Cause: Low humidity, hard water, or both. Fix: Increase humidity, switch to distilled water, mist lightly.

Yellow leaves dropping

Cause: Overwatering OR natural leaf turnover. Fix: Check soil moisture. If soggy, ease up. If normal, it’s just old leaves dying off — normal.

Leggy, stretched growth

Cause: Not enough light. Fix: Move to brighter (still indirect) spot. Pinch back leggy stems.

Mold on stems

Cause: Too wet, no air flow. Fix: Air exchange, add springtails, reduce misting.

Color varieties worth knowing

• ‘Red Anne’ — pink/red veins, classic
• ‘White Anne’ — white veins, very bright
• ‘Black Star’ — dark leaves with red veins, dramatic
• ‘Pink Wave’ — wider pink veining, looks like watercolor
• ‘Fortissimo’ — larger leaves, more impact

All have the same care needs. Pick the colors that fit your build.

Best companion plants in a terrarium

• Sheet moss (ground cover)
• Selaginella (moss-like texture)
• Pilea glauca (tiny round leaves, contrasting shape)
• Small ferns (different leaf structure)

Avoid pairing with: succulents, anything that needs dry feet.

Where to buy

• Etsy (search “fittonia cutting”)
• Local nurseries (often in the houseplant section)
• Facebook plant groups (cheap, lots of variety)
• Avoid: big box stores — often stressed and pest-ridden

The bottom line

Fittonia is the perfect “first interesting plant” for a terrarium builder. It rewards small attention, communicates clearly, and propagates easily so you’ll never run out. Start with one or two small plants, see how they settle in, and add more from there.

Questions about your fittonia? Hit the Discord — we have a whole channel dedicated to it.