Houseplant · Commelinaceae
Silver Inch Plant
Tradescantia zebrina
Give it a bright ledge and an occasional pinch, and this trailing inch plant dresses a corner in no time.
Bright indirect
64–75°F · 18–24°C
USDA 8–12
6–9 in · 15–23 cm
Overview
The silver inch plant is the sort of trailing houseplant that earns its place on a shelf, its leaves banded with silver and deep purple above and washed purple below. Part of the spiderwort family and native from Mexico down into Colombia, where it runs across the ground, it takes to indoor life by spilling over the rim of a pot or basket and softening whatever it hangs beside.
Its charm at home is matched by how little it asks. The stems grow quickly, root wherever they meet soil, and recover fast from a hard trim, so a shelf display stays easy to keep. The one thing that shapes where it belongs is good light, since the purple and silver fade to plain green in a dim corner and a bright ledge keeps the color that makes it worth displaying.
A word on the name is due. The old common name traces back to an antisemitic legend and is now widely dropped in favor of inch plant, silver inch plant, or wandering dude, the names most growers and references use today.
Care
The short version: a bright indirect spot keeps the color that carries a room, a drink once the soil surface dries with less in winter suits its rhythm, and a regular pinch of the tips keeps the display full rather than leggy.
Light
Give it bright indirect light for the truest color, with a little direct morning sun where the room allows. It will manage in low light, but the purple and silver drift to plain green and the stems stretch and thin.
Water
Water it well through the growing season, then let the soil surface dry before the next drink, and ease back across fall and winter. Keep it clear of soggy soil, since standing wet is the quickest way to rot the roots and stems.
Soil
Pot it in a well-drained peaty or loam and sand mix with drainage holes. It is easy about pH and settles happily anywhere from 6.0 to 8.0, acidic through to alkaline.
Temperature
Ordinary room warmth suits it, ideally 64°F to 75°F (18°C to 24°C). Keep it clear of cold drafts and chilly winter windowsills.
Humidity
Average household humidity is plenty, so there is no figure to chase. When the air runs very dry, a small lift in humidity keeps the leaf tips from browning.
Feeding
Feed monthly with a balanced houseplant fertilizer through spring and summer while it is growing. Set the feeding aside in fall and winter, when its growth slows.
Pruning
Pinch the stem tips often to keep the plant full and bushy and to head off legginess. The pieces you remove root with ease, so they can go straight back into the pot.
Repotting
Repot every 1 to 2 years or whenever it outgrows its container, given its quick growth. Watch for roots circling the pot or slipping through the drainage holes, leggy growth despite good care, or soil that dries almost as soon as you water.
Size & spacing
It keeps a low profile at 6 to 9 inches (15 to 23 cm) tall while trailing and spreading to 12 to 24 inches (30 to 61 cm) across. Give it a shelf edge or a hanging basket so the stems can cascade and frame the space below.
Troubleshooting
Most of what goes wrong with an inch plant comes back to light or water, and both are easy to read. Faded color and stretched stems mean it wants a brighter spot, while soft, mushy stems mean it is sitting too wet. Match what you see below and adjust early, and the display stays its best.
Soft brown stems and a display that suddenly slumps
When a pot sits too wet, root and stem rot takes hold and a handsome plant can slump within days. The stem bases go soft and dark, the soil refuses to dry, and an unpleasant smell sometimes drifts from it. Cut away every spoiled piece, re-root the sound cuttings in fresh, free-draining mix, and part with the sodden soil and anything past rescue so the collection stays its best.
Fix:
- Cut away all rotted tissue
- Take healthy cuttings and re-root them in fresh, well-drained mix
- Discard severely rotted plants and waterlogged soil
Webbing, stickiness, or leaves losing their polish
A few small pests can dull the plant's finish before a room notices anything amiss. Spider mites leave fine webbing, aphids gather as soft clusters, and mealybugs settle as white cottony tufts on the stems and leaf undersides. Rinse or wipe the foliage to clear the first wave, then treat with insecticidal soap or horticultural oil and repeat until the leaves look clean again. Move the plant apart from the rest of the collection while you do, so nothing carries over.
Fix:
- Rinse or wipe down foliage to dislodge pests
- Treat with insecticidal soap or horticultural oil and repeat as needed
- Isolate the plant to prevent spread
Color washing out and stems reaching for the light
A plant placed too far from a window quietly loses its style, and the reason is too little light. Set in shade, the purple and silver settle into an ordinary green while the stems stretch toward the glass with long gaps along their length. Give it a bright position with indirect sun, or a little morning light, then pinch the loose stems so the tidy, colorful look that flatters a room returns.
Fix:
- Move to a brighter spot with bright indirect light or some direct sun
- Pinch back stretched stems to encourage compact, colorful new growth
Sparse trailing stems that look thin on the shelf
Left unpinched over the years, the plant grows leggy, its stems trailing long and bare with foliage gathered only at the ends above a thin base, and the effect on a shelf turns spare rather than lush. A hard cutback low down coaxes fuller branching to fill the display again. Set the healthy tips you trimmed to root, then return them to the pot so the arrangement reads generous once more.
Fix:
- Pinch or cut back leggy stems to force branching
- Propagate the healthy tip cuttings to refill the pot for a fuller plant
Brown, papery tips that spoil the look
Brown, brittle tips and edges against otherwise healthy leaves are the plant's quiet signal that it has run too dry, at the roots or in the surrounding air. A thorough watering and a steady routine keep the soil from baking hard between drinks and preserve the neat foliage a styled corner depends on. Where a room runs especially dry, a small lift in humidity keeps those edges from browning.
Fix:
- Water thoroughly and resume a consistent watering routine
- Increase ambient humidity if air is very dry
Toxicity
This is a mild irritant rather than a real poison, though a little forethought about where it lives pays off. The sap can irritate skin, leaving people and pets red and itchy where they brush it, and a pet that chews a leaf may get a mildly upset stomach. Wear gloves when you prune, and place the trailing stems out of reach of animals inclined to chew.
Toxic to
Cats · Dogs · Horses · Rabbits · Livestock · Birds · People
Cats Mild
A cat that brushes a trailing stem where it drapes from a shelf can pick up a red, itchy patch from the sap. Should it sample a leaf, look for a little drooling and a mildly unsettled stomach, and nothing beyond that.
Dogs Mild
A dog moving past the foliage may end up with reddened, irritated skin, and a chewed stem brings some drooling and a touch of stomach upset. It rarely turns serious, though a spot out of a chewer's path is the wiser place to style it.
Horses Mild
The ASPCA lists this plant as causing dermatitis in horses, so contact with the sap can leave the skin red and irritated.
Rabbits Caution
The irritant sap that troubles cats and dogs makes this a poor plant to leave within a rabbit's reach. Display it well away rather than risk a sore mouth or an upset gut.
Livestock Caution
Grazing animals seldom cross paths with a decorative houseplant, yet the irritant sap would still bother a goat or sheep that nibbled it, so it belongs on the list to avoid.
Birds Caution
Firm guidance on birds is scarce, and the irritant sap makes caution the graceful choice. Keep a pet bird from pecking at or shredding the leaves.
People Caution
The sap is a known skin irritant, so styling the plant or taking cuttings can leave your hands red and itchy. Wear gloves when you prune and rinse afterward, and keep small children from chewing the foliage.
Wear gloves when taking cuttings or handling extensively, as the sap can irritate skin; wash hands after contact
Helpline numbers
United States
ASPCA Animal Poison Control: (888) 426-4435 (fee applies)
Poison Control: (800) 222-1222
Canada
Poison Centres: 1-844-764-7669
Varieties
Beyond the familiar striped species, a couple of selections turn up often and are worth knowing when you choose one for a room.
'Burgundy'
In place of the usual stripes, this selection offers deep, dark purple leaves that hold their color best, and read most dramatically, in bright light.
'Quadricolor'
Its leaves carry four colors at once, striped in pink, purple, silver, and green for a more decorative presence than the plain species.
How to propagate
This may be the easiest houseplant of all to multiply, which makes it simple to carry the same look from one room to the next.
Stem cuttingsEasy
Any time during active growth · Roots in 1-2 weeks
Few plants make it so simple to build a matching set for another room. While it is in active growth, take a stem or tip cutting, stand it in water or settle it into moist soil, and roots follow in 1 to 2 weeks. The stems are so willing that any node left resting on damp soil will root there on its own.
Myths
The old common name is simply a harmless piece of tradition.
In truth that name traces to an antisemitic legend and now reads as an ethnic slur. Extension services and plant references have largely moved to inch plant, silver inch plant, or wandering dude, and those are the names worth adopting.
The inch plant is entirely harmless to pets and people.
The ASPCA lists it as toxic to dogs, cats, and horses, in which the sap causes dermatitis. On people that same sap can leave the skin red and irritated, and a pet that chews it gets mild mouth and stomach upset. It is a mild irritant rather than a dangerous poison, but it is not quite the innocent plant it is often presented to be.