What do thrips look like on houseplants?

Thrips are slender insects about 1 to 2 mm long, shaped like tiny grains of rice or slivers. Adults are usually brown to black, sometimes with pale bands; larvae are pale yellow or white. They move quickly and hide in leaf folds and new growth.

What does thrips damage look like?

Thrips scrape leaf surfaces and suck out the contents of cells. That leaves silvery, papery streaks or patches, often dotted with tiny black specks of droppings. New leaves may emerge twisted, scarred or deformed. Flowers can be streaked and drop early.

How do I get rid of thrips on indoor plants?

Isolate the plant, shower it thoroughly, then spray all leaf surfaces with insecticidal soap, a houseplant-labelled oil, or spinosad where allowed, every five days for at least four weeks. Add blue or yellow sticky traps to catch adults, and replace the top layer of soil, where thrips pupate.

Where do thrips come from?

Most arrive on new plants, cut flowers or plants brought in from outdoors. Adults can also fly or drift in through open windows in summer. They spread between houseplants on air currents, hands and clothing.

Do thrips live in the soil?

Many species drop into the top layer of soil to pupate before emerging as adults. That's why treating leaves alone often fails. Covering the soil, replacing the top few centimetres of compost or using soil-dwelling predatory mites helps break the cycle.

Can thrips kill a houseplant?

A heavy, untreated infestation can weaken a plant badly and ruin new growth, but healthy, established plants usually recover once thrips are controlled. Damaged leaves won't heal, so judge progress by clean new growth.

Thrips on Houseplants: Signs, Damage and How to Get Rid of Them

Thrips on houseplants are hard to see and easy to underestimate. They're tiny, slender insects that hide in folded new leaves and flower buds, and the first sign is usually damage: silvery, scraped-looking streaks dotted with black specks, or new leaves that come out twisted and scarred.

Thrips breed fast, pupate in the soil where sprays don't reach, and move between plants. Beating them takes a few weeks of steady treatment, but it's very achievable.

How to recognise thrips

Sign	What it looks like
Adults	Slender, 1–2 mm, brown to black, sometimes banded; quick-moving
Larvae	Pale yellow or white, wingless, slow
Leaf damage	Silvery or bronze, papery streaks and patches
Droppings	Tiny black specks on damaged areas
New growth	Twisted, scarred, distorted, sometimes with brown edges
Flowers	Streaks, spots, early drop

To check, hold a sheet of white paper under a leaf and tap the leaf sharply. Small dark specks that crawl or flick on the paper are likely thrips. A 10x hand lens or a phone camera zoom helps.

Thrips damage vs other problems

Symptom	Thrips	Spider mites	Sunburn
Pattern	Silvery streaks with black dots	Fine pale stippling, webbing	Bleached patches on sun-facing leaves
Insects visible	Slender, fast-moving	Tiny moving specks; webs	None
New growth	Often distorted	Usually normal shape	Normal

For mites, see spider mites on plants. For an overview of all common pests, see houseplant pests.

Plants thrips commonly attack

Aroids: monstera, philodendron, Philodendron Birkin, pothos, satin pothos, anthurium, alocasia
Ficus and rubber plants
Calathea and prayer plants
Dracaena and croton
Flowering plants such as African violets and orchids

Western flower thrips and echinothrips are among the species most often found on houseplants.

The thrips life cycle

Eggs are inserted into leaf tissue, where sprays can't reach them.
Larvae hatch in a few days and feed on leaves, especially new growth.
Pre-pupae and pupae of many species drop into the soil or hide in leaf litter and crevices. They don't feed and are protected.
Adults emerge, feed, mate and lay more eggs. Many can fly.

At room temperature the whole cycle takes about two to three weeks, and generations overlap. That's why you need to treat repeatedly for at least four weeks, and why soil matters.

Step-by-step: getting rid of thrips

Isolate the plant immediately, and check plants nearby.
Cut off badly damaged leaves and flowers and bag them.
Shower the plant with lukewarm water, top and bottom of every leaf and into the leaf folds. Cover the soil first.
Deal with the soil. Remove the top 2 to 3 cm of compost and replace it with fresh, or cover the soil surface with a layer of fine grit, to disrupt pupae.
Spray thoroughly with insecticidal soap, horticultural oil or neem oil labelled for houseplants, or spinosad where approved for indoor use. Coat both sides of every leaf and the new growth until it drips.
Hang sticky traps. Blue traps attract thrips especially well; yellow ones also work.
Repeat spraying every four to five days for at least four weeks, wiping or showering in between.
Watch new growth. Clean, undamaged new leaves mean you're winning. Keep monitoring for a month after the last thrips.

Biological control

Predatory mites are very effective indoors, especially in larger collections:

Predator	Targets	Notes
Amblyseius cucumeris (Neoseiulus cucumeris)	Young thrips larvae on leaves	Sachets hung on plants; slow-release
Amblyseius swirskii	Thrips larvae, whitefly	Needs warmth, above about 20 °C
Stratiolaelaps scimitus (Hypoaspis miles)	Thrips pupae in soil, fungus gnat larvae	Added to soil surface

Don't spray insecticides, even soap, while using predators. Start predators after one or two cleaning showers to reduce numbers first.

Treatments compared

Treatment	Strength	Limitations
Showering	Removes many adults and larvae	Doesn't touch eggs or pupae
Insecticidal soap	Kills larvae and adults on contact	Needs thorough coverage; repeat
Horticultural oil / neem	Contact kill, some deterrence	Test on sensitive plants; not in sun
Spinosad	Effective on thrips	Check local approval and label for indoor use
Sticky traps (blue/yellow)	Catch adults; good for monitoring	Won't control an infestation alone
Predatory mites	Long-term control	Need conditions and patience
Systemic insecticides	Can control feeding stages	Check legality; follow label exactly

Treating a whole collection

Thrips rarely stay on one plant. If you find them, assume nearby plants are affected until you've checked.

Inspect every plant within a metre or two, focusing on the newest leaves, leaf undersides and flower buds. Use the white paper tap test on each.
Group affected plants together in one area, away from clean ones, so you can treat them as a batch.
Treat clean neighbours preventively with a shower and one or two rounds of soap spray, especially aroids and ficus.
Clean the area. Wipe windowsills, shelves and pot rims, and throw away fallen leaves, where pupae can shelter.
Keep a simple log. Note the date of each spray, what you used and whether new damage appears. It's easy to lose track over four weeks.
Don't move plants back until each one has produced at least two clean new leaves.

Mistakes that keep thrips coming back

Stopping after one or two sprays. Eggs inside leaves hatch after you think they're gone.
Spraying only the tops of leaves. Thrips shelter underneath and in folds.
Ignoring the soil. Pupae in the top layer of compost emerge as new adults.
Mixing treatments with predatory mites. Sprays kill the predators too.
Bringing home bouquets and setting them next to your plants during treatment.

Preventing thrips

Quarantine new plants for two to four weeks and inspect new leaves and soil.
Keep cut flowers away from houseplants. Bouquets often carry thrips.
Inspect regularly, particularly the newest leaves and flower buds.
Hang a blue sticky trap near your collection as an early warning.
Shower plants every few weeks; it removes many pests before they build up.
Check plants coming in after a summer outdoors.

Dry air doesn't cause thrips, but stressed plants are hit harder. Good light, steady watering and appropriate humidity help plants grow through damage.

How long it takes

With thorough spraying every four to five days, most people see far fewer thrips within two weeks and clean new growth within four to six. Larger plants with dense foliage, like big monsteras or ficus, take longer because coverage is harder. Plants with many flowers are harder still, since buds shelter larvae; removing flowers during treatment speeds things up.

Will damaged leaves recover?

No. Silvery, scarred tissue stays that way. Leaves still help feed the plant, so leave lightly damaged ones in place. Remove badly damaged ones once the plant has produced clean new growth.

Quick checklist

Isolate the plant and check neighbours
Shower thoroughly; cut off the worst leaves
Replace or cover the top layer of soil
Spray every four to five days for at least four weeks
Blue sticky traps for monitoring
Consider predatory mites for a large collection

Sources and further reading

University of California IPM: Thrips, for biology and management.
Royal Horticultural Society: Thrips, for identification and indoor control.
University of Florida IFAS: Western flower thrips, for life cycle details.