How to Get Rid of Thrips on Houseplants

Quick answer: Isolate the plant, rinse the leaves, then spray insecticidal soap or spinosad every 5 to 7 days for at least 3 to 4 weeks — and treat the soil too. One spray never finishes thrips, because eggs hide inside leaves and pupae hide in the soil.

If your plant’s leaves have gone silvery and scraped-looking, with tiny black specks and new growth that comes out twisted, you may be dealing with thrips. They are small, fast, and easy to miss — most people notice the damage long before they ever see the insect itself. The good news: thrips are very beatable. The catch: beating them takes repetition, not one heroic spray.

This guide shows you how to confirm thrips, run a 7-step plan that actually clears them, and keep them from spreading to the rest of your collection.

How to Tell If It’s Thrips

Thrips are slender insects less than 1/8 inch long, straw-yellow to dark brown, with narrow fringed wings. The young are paler, cream to yellow, and wingless. Both move quickly when disturbed, which is why they are so hard to spot on a casual glance.

• Silvery, bronze, or pale scraped streaks along the veins and across the leaf surface
• Tiny black specks scattered over the damaged patches — thrips droppings, like ground pepper
• New growth that comes out twisted, curled, scarred, or stunted
• Damaged areas that turn papery, then yellow, and eventually drop
• Small insects that run or flick away when you disturb a leaf

Try the white-paper test: hold a leaf over a sheet of white paper and tap it gently. Tiny moving specks, about the size of a comma, are very likely thrips. Check the undersides of leaves and inside the folds of new growth first — that is where they feed and hide. Then check every plant that was sitting within a couple of feet, since thrips spread easily between touching leaves.

Thrips or Something Else?

Several pests cause pale, speckled leaves, so confirm before you treat. The black specks plus the silvery streaks together are the classic thrips signature.

Pest	What you see	What rules it out for thrips
Thrips	Silvery streaks plus black specks, twisted new growth	—
Spider mites	Fine pale stippling, often with webbing	Webbing, and no black specks
Mealybugs	White cottony clumps in leaf joints and stems	Cottony masses, not streaks
Fungus gnats	Tiny dark flies hovering over the soil	Flies at soil level, no leaf streaking
Scale	Hard brown bumps on stems and leaves that do not move	Bumps that stay put

If you see small pale worms or larvae in the potting mix instead, those are a different problem — see our guide to tiny white bugs in soil.

Why Thrips Keep Coming Back

Thrips return because a single treatment only kills the adults and larvae sitting on the leaves. Females insert their eggs inside leaf tissue, where contact sprays cannot reach them. Many species then drop into the top inch or two of soil to pupate. A new wave hatches days after you thought you had won.

At typical indoor temperatures of 70 to 80 degrees Fahrenheit, thrips can go from egg to adult in about 2 to 3 weeks. That is why the schedule matters more than the product: treating every 5 to 7 days catches each new group of larvae before it matures and lays more eggs. The University of California IPM notes the same core approach — wash thrips off with water, dispose of infested plant parts, and consider horticultural oil or insecticidal soap.

Warm, dry air favours them. Forced-air heat in winter can drop indoor humidity to 20 to 30 percent, and plants parked next to a heat vent are often hit hardest. Thrips feed on a wide range of houseplants, and frequent targets include monstera, philodendron, pothos, ficus, anthurium, hoya, calathea, peace lily, and dracaena. They also arrive easily on new plants, cut flowers, and plants brought back inside after a summer outdoors.

The 7-Step Plan That Actually Clears Thrips

Follow these steps in order. Skipping the repeat treatments or the soil step is how most thrips comebacks happen.

1. Isolate the plant. Move it to a separate room, or at least 6 feet from other plants. A bathroom with a bright window works well. Check every plant that was nearby.
2. Prune the worst leaves. Cut off leaves that are heavily silvered, crispy, or dropping — they hold many eggs and larvae. Bag the clippings and put them in the outdoor trash, not an indoor bin.
3. Rinse and wipe. Take the plant to the shower or sink and rinse the leaves with lukewarm water, paying special attention to undersides, leaf joints, and new growth. Cover the soil with plastic wrap so it does not wash out or get soaked — soggy soil brings its own problems, as explained in our overwatered vs underwatered guide. After rinsing, wipe each leaf with a soft cloth, then clean the pot rim, saucer, and shelf where the plant sat.
4. Spray the foliage thoroughly. Once the leaves are dry, spray all surfaces with insecticidal soap or a houseplant spray containing spinosad, following the label exactly. Coverage is everything: soap only kills thrips it touches directly, so coat the undersides and the folded tips of new growth until the leaves are wet. Test on one leaf and wait 24 to 48 hours before treating the whole plant, and keep the plant out of strong sun until it is dry.
5. Treat the soil. Scrape off the top 1 to 2 inches of mix and replace it with fresh potting soil — this removes a share of the pupae. For a heavy infestation, repot fully into fresh mix and a cleaned pot.
6. Hang sticky traps. Place a yellow or blue sticky trap at leaf height in or beside the pot. Replace it weekly and watch the catch numbers fall — a trap that stays empty for 2 to 3 weeks after your last spray is a good sign the infestation is over.
7. Repeat on schedule. Spray again every 5 to 7 days for at least 3 to 4 weeks, even after the plant looks better. Mark the dates on your calendar or phone so you do not skip a round.

Your 4-Week Treatment Calendar

Week	What to do	What you should see
Week 1	Isolate, prune, rinse, first spray, soil top-up, traps up	Fewer live thrips; damage stops spreading as fast
Week 2	Second and third sprays, 5 to 7 days apart; replace traps	Trap catches falling; no new silvering on fresh leaves
Week 3	Fourth spray; check neighbouring plants weekly	New growth coming out cleaner, less twisted
Week 4	Final scheduled spray; keep traps up	Clean new growth; traps nearly empty
After week 4	Keep traps up 2 to 3 more weeks; inspect weekly	Empty traps and clean growth mean you can end isolation

Which Treatments Work — and Which Don’t

Insecticidal soap breaks down the soft outer layer of thrips and kills them on contact. It leaves no lasting residue, which is exactly why repeat applications are essential. Use a ready-made insecticidal soap, not dish detergent — dish soaps can contain degreasers and fragrances that damage leaves.

Neem oil works as a contact treatment and discourages feeding, but it can leave a film and an odour, so many growers prefer to use it in a well-ventilated room. Test it on one leaf first, as with any spray.

Spinosad comes from a naturally occurring soil bacterium and is one of the more effective active ingredients against thrips, working on contact and when thrips eat treated leaf tissue. Follow the label interval, usually around 7 days, and rotate it with insecticidal soap rather than relying on one ingredient for months — thrips can build resistance to any single product.

Predatory mites that hunt thrips are available for home use and work well indoors, but they need several weeks and are killed by most sprays. If you use them, stop spraying first, or rinse thoroughly and wait a few days before release.

Do not rely on diluted vinegar, garlic sprays, or cinnamon on the soil — they have little reliable evidence against thrips and can harm leaves. Fully drying out the soil does not stop pupae in the mix, and it stresses the plant.

When to Move to Stronger Treatments

Move to stronger options when thrips are still showing up on traps and new damage is still appearing after 3 to 4 weeks of consistent soap or neem treatment. Spinosad is the usual next step. Systemic insecticides, which are taken up through the roots and move into the leaves, can help stubborn infestations on ornamental plants, but they are not for edible plants or herbs, they should never be used on plants that will go outdoors to flower (several are highly toxic to bees), and treated pots must be kept away from pets and children. Read and follow the label exactly.

How to Keep Thrips From Spreading

• Quarantine every new plant for 3 to 4 weeks before it joins your collection, and inspect leaf undersides and new growth before it moves in. A preventive rinse in the shower on arrival removes many hitchhikers.
• Keep cut flower bouquets away from houseplants, especially in the first week — they can carry thrips too.
• Space plants so their leaves do not touch, and check neighbouring plants weekly during treatment and for 2 to 3 weeks after it looks gone.
• Wipe pruners with rubbing alcohol between plants, and wash your hands after handling an infested pot.
• Raise humidity to around 40 to 60 percent — see our guide to increasing humidity for houseplants. Humidity alone will not cure an infestation, but dry air speeds breeding, so it slows the cycle and helps leaves recover.

Recovery: What to Expect

Most houseplants recover well once thrips are gone, but damaged leaves stay scarred permanently — no spray restores them. The sign that you are winning is healthy new growth without silvering or twisting. Expect fewer adults in the first week, cleaner new growth by weeks 3 to 4, and a full-looking plant again over weeks to a couple of months, depending on how fast the species grows.

While it recovers, give the plant bright, indirect light, water when the top inch or two of soil is dry, and hold off heavy feeding until you see fresh, clean growth. Remove badly scarred leaves gradually, so the plant keeps enough leaf area to keep growing.

When to Give Up on a Plant

Sometimes the kindest move for the rest of your collection is to let one plant go. Consider discarding the worst plant if it is heavily infested and weak, if thrips are still spreading after 4 to 6 weeks of consistent treatment, or if it is a cheap, replaceable plant threatening plants you cannot replace. Bag it, put it in the outdoor trash, clean the spot where it sat, and keep checking its neighbours for a few weeks. That is not failure — it is protecting everything else you grow.

Related Rescues

• How to Get Rid of Spider Mites on Houseplants
• How to Get Rid of Mealybugs on Houseplants
• How to Get Rid of Fungus Gnats in Houseplants