Identity & taxonomy
- Scientific name
- Soleirolia soleirolii (Req.) Dandy
- Family
- Urticaceae
- Genus
- Soleirolia
- Order
- Rosales
- IUCN status
- Least Concern (LC)
- Wikidata
- Q310537
- Helxine soleirolii Req.
- Parietaria soleirolii (Req.) Sweet
- Baby's tearsen
- Mind-your-own-businessen
- Angel's tearsen
- Corsican carpet planten
- Helxineen
- Tårarnas växtsv
- Englestårerno
- Engletårerda
- Enkelinkyyneleetfi
- Bubikopfde
Mediterranean islands (Corsica, Sardinia, Mallorca, Menorca, Capraia)
How to identify it
Growth habit. Creeping evergreen perennial that forms a dense low mat of thin trailing stems clothed in tiny leaves. Stems root readily wherever they touch moist soil, and the plant spreads by both creeping growth and self-rooting fragments. Old leafy stems persist underneath new growth, building up a 1–3 cm thick mat over time. Tiny inconspicuous flowers appear year-round but are rarely noticed without close inspection.
Leaves. Tiny round to broadly oval leaves 2–6 mm across, glossy bright green, on thin pale-green creeping stems. Each leaf is on a very short petiole and arranged alternately along the stem. Texture is smooth and slightly succulent; the whole leaf surface is glabrous (hairless). Cultivar 'Aurea' has yellow-green chartreuse foliage; 'Variegata' has cream-edged leaves.
Flowers. Tiny solitary cream-white or pinkish flowers 1–2 mm across in leaf axils, year-round but rarely noticed. The species is monoecious (male and female flowers on the same plant) and self-fertile.
- Tiny round bright-green leaves 2–6 mm — moss-like at a distance.
- Thin pale-green creeping stems forming a dense low mat.
- Stems root at every node touching moist soil.
- Glossy hairless leaves — distinguishes from many true mosses.
- Collapses dramatically within hours of drying out.
Commonly confused with
Krauss's spike moss
True spike moss with feathery overlapping scale-leaves on creeping stems. NOT a flowering plant; reproduces by spores. Less moisture-demanding than Soleirolia. Often confused at a glance because both fill the 'mossy carpet' niche.
Tiny tears / depressa
Small Pilea with similar tiny round leaves, but leaves are slightly larger, on stiffer stems, and usually a duller green. Tolerates lower humidity than Soleirolia. Pilea is in the same family (Urticaceae) but a distinct genus.
Cuba (aquarium plant)
Aquatic plant used in planted aquariums — tiny round leaves on creeping stems forming an underwater carpet. Looks superficially similar to baby's tears but lives entirely submerged.
Irish moss / pearlwort
Outdoor garden ground cover with similar moss-like form but leaves are needle-shaped (not round). Tolerates much colder conditions and is grown between paving stones. NOT a houseplant.
Care
Light
Medium to bright indirect light; avoids direct sun.
An east window, a north-bright window, or 1.5 m back from south or west window with sheer curtain. Bright indirect light produces the densest carpet and richest green colour. Direct unfiltered sun bleaches the leaves and causes the carpet to brown out within days. Below 3,000 lux the plant becomes thin and pale.
Seasonal: Nordic latitudes above 55°N: tolerates the dim winter without collapse if humidity stays high. The brightest available indirect spot is preferred but not strictly required.
Water
Keep evenly moist — every 2–4 days; never let it dry out.
Soleirolia soleirolii has the shallowest tolerance for drying out of any common houseplant. A single missed watering causes dramatic collapse — the entire mat goes limp within hours. Recovery is usually full within hours of rewatering, but repeated dry-outs degrade the plant over time. Bottom-water by sitting the pot in a shallow tray for 20 minutes, or top-water gently to avoid disturbing the delicate mat.
Seasonal: Reduce frequency very slightly in winter when growth slows, but never let the soil dry out fully. This species needs more attention than typical 'dry between waterings' houseplants.
Soil
Light, moisture-retentive, peat-free houseplant mix.
Two parts peat-free houseplant mix, one part fine bark, one part coir or sphagnum. The mix should hold moisture without staying soggy at the bottom. Soleirolia is shallow-rooting and prefers a consistent moisture level throughout the rootball.
Humidity
60–80 % required; below 50 % causes rapid collapse.
The killer feature of Soleirolia soleirolii as a houseplant. Dry indoor air below 50 % causes the carpet to brown out and collapse within days. The species genuinely thrives in three settings: closed terrariums (effortless), bright bathrooms (typical 60 %+ humidity from showering), and well-watered grouped-plant arrangements. Open dry living rooms with central heating are not workable without active humidification.
Temperature
13–22 °C; tolerates 5 °C briefly.
Tolerates cooler temperatures than most tropical-looking houseplants — the species is from Mediterranean islands with cool wet winters. Outdoors it survives mild frost in sheltered conditions but is killed by hard freezing. Sustained heat above 25 °C combined with low humidity causes browning.
Fertilizer
Quarter-strength balanced feed monthly in growing season.
A very light feeder. Quarter-strength balanced NPK monthly April–September; full-strength feed scorches the delicate leaves. Many growers skip fertilising entirely if the plant is in a fresh peat-free houseplant mix, which provides enough nutrients for the first year.
Pruning
Trim the carpet with scissors to reshape; remove yellowed patches.
Trim the carpet flat with sharp scissors to reshape or contain its spread — Soleirolia tolerates being mowed and rebounds within 1–2 weeks. Remove yellowed or browned patches by pinching out the affected area; the surrounding plant fills the gap quickly. The mat tends to die out from the centre as it ages; periodic refreshing by lifting and replanting healthy edge sections is normal maintenance.
Repotting
Refresh annually; rebuild the mat from edge cuttings every 2–3 years.
The mat ages from the centre outward. Annual refreshing involves trimming the carpet, lifting healthy edge sections, and replanting them as the new top layer. Every 2–3 years, lift the entire mat, divide healthy sections, and start a fresh planting. Use shallow wide pots — Soleirolia is shallow-rooting and a deep pot wastes space.
Division of the mat
easy~Immediate; full coverage in 2–4 weeksLift a section of the mat with roots intact and place on moist potting mix. The section establishes within days and starts spreading within 2–4 weeks. The most common and reliable propagation route — a single small starter mat fills any pot quickly.
Stem fragments
easy~1–3 weeksTiny stem fragments with a few leaves root readily on moist soil. Sprinkle clipped pieces onto fresh potting mix, mist lightly, and cover with a clear lid for high humidity. New rooting and growth visible within 1–3 weeks. The species is so easy to propagate that lab cultures and aquaponic setups often use it as a moss substitute.
Cultivars
'Aurea' / 'Golden Queen'
Yellow-green to chartreuse foliage; brightens shady terrarium displays.
'Variegata' / 'Silver Queen'
Green leaves with cream-white margins; slower-growing than the species.
Common problems
Whole carpet collapsing dramatically
Symptom
Within hours, the entire mat goes limp and looks dead.
Cause
Soil dried out completely — Soleirolia has the shallowest drought tolerance of any common houseplant.
Fix
Water immediately, ideally bottom-watering by sitting the pot in a shallow tray for 20–30 minutes. Recovery is usually full within hours. The species recovers from a single dry-out without lasting damage but does NOT tolerate repeated dry-outs.
Brown patches in the centre of the mat
Symptom
Brown dead patches develop in the centre of an otherwise healthy carpet.
Cause
Either old central tissue dying naturally as the mat ages, low humidity below 50 %, or root rot in compacted central soil.
Fix
Pinch out browned patches; surrounding plant fills the gap within weeks. Run a humidifier nearby. If browning is widespread, lift healthy edge sections and replant as a fresh mat.
Carpet looking thin and pale
Symptom
Mat is sparse, leaves are pale, growth is slow.
Cause
Light too low, or the mat is exhausted and needs refreshing.
Fix
Move to a brighter indirect spot. If the mat is more than 2–3 years old, lift and divide healthy sections and replant in fresh mix.
Sticky honeydew on leaves
Symptom
Sticky shiny coating on leaves, sometimes with small green or pink soft-bodied insects.
Cause
Aphids — the carpet creates microclimate niches where aphids hide easily.
Fix
Shower under tepid water from a fine spray. Severe infestations are difficult to clean from a dense mat; trimming the carpet flat and treating with insecticidal soap weekly for 4 weeks is more effective than spot treatment. Severely infested plants are sometimes easier to discard and start fresh from edge cuttings.
Grey fuzz on parts of the carpet
Symptom
Grey fuzzy patches appear on dense areas of the mat.
Cause
Botrytis grey mould — common in stagnant cool wet conditions, especially in closed terrariums with poor airflow.
Fix
Improve airflow; open terrarium lids partially for several hours per day. Remove affected sections. Reduce watering frequency slightly. Severe infections may require lifting healthy edge sections and starting fresh.
- Aphids on emerging tips
- Fungus gnats in damp soil
- Spider mites in dry winter air
- Botrytis grey mould in stagnant cool wet conditions
- Root rot from waterlogged soil
Toxicity & safety
No reported toxicity in humans.
Soleirolia soleirolii — North Carolina Extension Gardener Plant ToolboxSoleirolia soleirolii is not listed in ASPCA's toxic plant database. Generally considered safe for cats with no documented poisoning cases.
ASPCA Toxic and Non-Toxic Plants — Soleirolia not listed in toxic databaseSoleirolia soleirolii is not listed in ASPCA's toxic plant database. Generally considered safe for dogs.
ASPCA Toxic and Non-Toxic Plants — Soleirolia not listed in toxic databaseWhy baby's tears is the perfect terrarium plant
Soleirolia soleirolii is the textbook terrarium plant — it actively thrives in the conditions that kill most houseplants in dry rooms. A closed glass terrarium maintains 80–95 % humidity continuously through the natural water cycle of evaporation and condensation, which is exactly what baby's tears wants. Inside a terrarium, the species spreads vigorously, fills any open soil within weeks, and looks like a luxuriant moss carpet without the slow growth of actual mosses.
Outside a terrarium in open dry indoor air, the same plant struggles desperately. Below 50 % humidity it browns and collapses within days; below 35 % it dies entirely. Even with a humidifier running nearby, baby's tears in an open pot is one of the higher-maintenance houseplants — needing constant attention to moisture levels and careful placement away from heat sources.
If you have a closed terrarium or bottle garden, this is one of the easiest plants you can possibly add. If you have a bright bathroom with humidity reliably above 60 %, baby's tears in an open pot will thrive there too. If you have an ordinary heated living room with central heating in winter, choose a more drought-tolerant alternative — this is not the right plant for that environment.
How to refresh an aging baby's tears mat
Soleirolia soleirolii in a pot ages predictably: the centre of the mat dies out first while the edges stay vigorous. Within 2–3 years, even a healthy plant develops a 'donut' shape — thriving outer ring, brown dead centre. This is normal and is the same pattern that happens in the species' wild Mediterranean populations.
The fix is straightforward and works perfectly because Soleirolia propagates so easily. Lift the entire mat from the pot with a wide spatula or kitchen palette knife. Identify the healthiest outer sections — bright green, dense, well-rooted. Tear or cut these into segments roughly 5–10 cm across. Discard the dead central material.
Plant the healthy segments edge-to-edge across the surface of fresh moist potting mix in the same or a shallow new pot. Press lightly so the segments are in contact with the soil. Water in well, cover loosely with a clear plastic sheet or terrarium lid for two weeks to maintain humidity, and resume normal care. Within 4–6 weeks the segments knit together into a fresh dense carpet. Repeat every 2–3 years to keep a baby's tears mat looking its best long-term.
Despite the moss-like appearance, Soleirolia soleirolii is a flowering plant in the nettle family (Urticaceae) — a close relative of true nettles (Urtica) but without any sting. The species was named twice: first as Helxine soleirolii by French botanist Esprit Requien in 1825, then transferred to a new genus Soleirolia by James Edgar Dandy in 1965 (after the genus name 'Helxine' was discovered to be already in use for another plant). Both the genus name and the species epithet honour Joseph François Soleirol, a 19th-century French military officer and amateur botanist who collected the species in Corsica.
Frequently asked · 5
Is baby's tears safe for cats and dogs?+
Yes — generally. Soleirolia soleirolii is not listed in the ASPCA's toxic plant database, and no poisoning cases are documented. The species is in the nettle family (Urticaceae) but does not have stinging hairs and is generally considered pet-safe. One of the better choices for terrariums in pet households.
Why has my baby's tears suddenly collapsed?+
Almost always thirst — Soleirolia soleirolii has the shallowest drought tolerance of any common houseplant. A single missed watering causes the entire mat to go limp within hours. Bottom-water by sitting the pot in a shallow tray for 20–30 minutes; recovery is usually complete within hours. The species recovers from a single dry-out without lasting damage but does NOT tolerate repeated drying.
Can I grow baby's tears in a closed terrarium?+
Yes — it's one of the best terrarium plants available. Closed terrariums maintain 80–95 % humidity, which is exactly what Soleirolia wants. The species spreads vigorously inside terrariums and fills open soil within weeks. Watch for grey mould (botrytis) in stagnant cool conditions; open the lid for a few hours every couple of weeks to refresh airflow.
Why is the centre of my baby's tears dying?+
Normal aging pattern. The centre of a Soleirolia mat dies out as the plant ages while the edges stay vigorous, producing a 'donut' shape over 2–3 years. The fix is to lift the mat, salvage healthy outer sections, discard the dead centre, and replant the healthy segments edge-to-edge in fresh mix. The plant rebounds within 4–6 weeks.
Is baby's tears actually a moss?+
No, despite the appearance. Soleirolia soleirolii is a flowering plant in the nettle family (Urticaceae) — a close relative of true nettles but without any sting. True mosses are non-vascular plants that reproduce by spores, much older and simpler than baby's tears. The convergent moss-like appearance comes from the tiny round leaves and creeping mat habit; close inspection reveals tiny flowers in the leaf axils that no real moss would produce.