To get rid of spider mites on houseplants, you need to physically remove the existing population and then treat with an appropriate spray — repeated multiple times over two to three weeks to catch new hatchlings. Spider mites are very small and spread quickly between plants; catching an infestation early and treating it systematically is significantly easier than dealing with a heavily infested plant or a collection that has been exposed. A single treatment is almost never sufficient, as eggs are resistant to most contact treatments and will hatch within a few days of the initial spray.
How to Identify Spider Mites
Spider mites are too small to see individually without magnification, but their damage and webbing are visible. The first sign is pale stippling or silvery speckling on the upper leaf surface — each tiny spot is where a mite has pierced a leaf cell and extracted its contents. As the infestation progresses, you will see fine webbing on the undersides of leaves and in the gaps between leaves and stems. In a heavy infestation, the webbing can be extensive and the plant can look dusty or dirty. Moving a heavily infested leaf and looking closely reveals the mites as tiny moving dots.
Checking the undersides of leaves regularly — at least every two weeks — is the most reliable way to catch spider mites before they establish. Look for speckling on the upper surface and fine webbing on the underside, particularly along the central vein.
Immediate Steps When You Find Spider Mites
Isolate the affected plant immediately, away from your other plants. Spider mites spread by contact and by being carried on clothing or tools. Even a few days of contact with neighbouring plants can establish a new population.
Give the plant a thorough shower or wipe-down. Take it to the sink or shower, support the pot, and wash the entire plant thoroughly with a lukewarm water jet directed at the undersides of all leaves. This physically removes large numbers of mites and webbing before treatment and makes subsequent sprays significantly more effective. Wipe any stubborn webbing off with a damp cloth or cotton ball.
Treatment: What Works Against Spider Mites
The most widely available and effective treatments for spider mites on houseplants are neem oil, insecticidal soap, and — for more serious infestations — dedicated miticides. Each works by disrupting the mite's physiology on contact.
Neem oil: A natural plant-derived oil that disrupts spider mite feeding and reproduction. Mix to the directions (typically 5 ml neem oil, 2 to 3 ml of dish soap as an emulsifier, per litre of water) and spray thoroughly on all surfaces including undersides of every leaf, stem junctions, and the growing tip. Apply in the evening to avoid any interaction with bright light. Neem oil has a residual effect of several days and acts on eggs as well as adults.
Insecticidal soap: Disrupts cell membrane function in mites on contact. Very effective when applied thoroughly and repeatedly. No residual effect — only kills mites it directly contacts, which is why repeated application is essential to catch hatchlings.
Apply either treatment every five to seven days for at least three to four cycles. Do not stop after one treatment, even if the plant looks clear — mite eggs hatch within a few days and a new population will re-establish quickly from unhatched eggs.
Environmental Prevention
Spider mites thrive in hot, dry conditions — exactly the environment created by central heating in UK homes in winter. Increasing humidity around plants is one of the most effective preventive measures. Group plants together, use a pebble tray with water (see our guide to houseplant humidity), or run a humidifier in the room. Mites struggle to establish on plants with moist leaf surfaces.
Regularly wiping down leaves with a damp cloth removes potential food sources and early-stage mite populations before they establish. This is particularly useful as a routine for susceptible species like Calatheas, Anthuriums, and Monsteras.
Which Plants Are Most Vulnerable to Spider Mites
Spider mites attack a wide range of houseplants but are most frequently found on Calatheas, Philodendrons, Monsteras, Palms, Citrus, Hoyas, and Schefflera. Plants already stressed from underwatering, low humidity, or poor light are more susceptible than healthy plants. Maintaining good cultural conditions is genuinely protective against spider mite establishment. See our guide on common houseplant pests for a full overview of all major UK houseplant pests.
Related Questions Worth Knowing
Can I use alcohol to kill spider mites? Isopropyl alcohol (rubbing alcohol) at 70% concentration kills mites on contact when applied to leaves with a cotton ball or spray. It is effective for spot treatment of accessible colonies but dries too quickly to provide residual protection and can damage sensitive foliage at full strength. Dilute to 50% if using on soft-leaved plants. Use as a first-response spot treatment rather than a primary treatment method for larger infestations.
My plant keeps getting spider mites after treatment — why? Recurring infestations after repeated treatment usually mean the environmental conditions are favourable to spider mites (hot, dry room), or that the treatment is not being applied thoroughly enough or frequently enough to break the egg cycle. Increase the number of treatment cycles, ensure the underside of every leaf is reached by the spray, and address the room humidity. See our guide on why pests keep coming back for more.
Are spider mites visible to the naked eye? Individual spider mites are barely visible to the naked eye — as tiny dots on the leaf surface. Their webbing and the stippled damage they cause are much more visible. If you hold a white piece of paper under a suspected leaf and tap it, mites will fall onto the paper and you can see them moving. This is the standard confirmation test for a spider mite infestation.