Spider Mites on Houseplants: How to Spot and Get Rid of Them
Spider mites are one of the most destructive houseplant pests, partly because they are so small that most people do not notice them until the plant is already struggling. Catching them early makes the difference between a quick fix and losing the plant.
How to spot them
Spider mites are barely visible, often less than half a millimetre. Look for the signs rather than the mites themselves:
- Stippling: tiny pale or yellow dots across the leaves, where mites have pierced the surface
- Fine webbing: delicate strands between leaves and stems, most visible at the leaf joints
- A dull, dusty look to leaves that should be glossy
- Leaves yellowing, then drying and dropping
A reliable test: hold a sheet of white paper under a leaf and tap the leaf. If tiny specks fall and slowly crawl, you have mites.
Why they spread fast
Spider mites thrive in warm, dry conditions, exactly what most heated or air-conditioned homes provide. A female can lay dozens of eggs, and a population can explode within a week or two. They also move easily from plant to plant.
How to get rid of them
1. Isolate the plant immediately. Move it well away from every other plant so the mites cannot spread.
2. Rinse the plant. Take it to a sink or shower and spray the leaves thoroughly, especially the undersides. This physically removes a large share of the mites and webbing.
3. Treat with insecticidal soap or neem oil. Coat all surfaces, undersides included. This is the core treatment.
4. Repeat every five to seven days, for at least three rounds. This is the step people skip. One treatment does not kill the eggs. You must keep treating to catch each generation as it hatches.
5. Wipe down the area where the plant sat, in case mites or eggs were left behind.
Prevent them coming back
- Spider mites hate humidity, so raising humidity around your plants makes your home less hospitable to them.
- Inspect new plants before bringing them home, and keep them separate for a couple of weeks.
- Check your plants regularly. A quick look at the leaf undersides once a week catches problems early.
When to give up on a plant
If an infestation is severe and the plant is mostly webbed and defoliated, it is often wiser to discard it than to risk it reinfecting your collection. A single heavily infested plant is not worth losing the rest.
Related articles
Brown Leaf Tips: Why They Happen and How to Stop Them
Brown, crispy leaf tips are one of the most common houseplant complaints. Here are the real causes and how to fix each one.
How to Save an Overwatered Plant, Step by Step
Overwatering is the top killer of houseplants. If you catch it early, this step-by-step rescue gives the plant a real chance.