Common Houseplant Pests: Identification & Treatment Guide

Finding pests on your houseplants is never fun. Even with the best care, tiny bugs can sometimes appear on leaves, stems or in the compost, especially when plants are stressed, crowded or brought in from a grower, garden centre or another home.

The most important thing is to act quickly. Most houseplant pests are much easier to control when caught early.

Need help treating plant pests?
Browse our SB Invigorator Spray, Pepin Neem Oil and fungus gnat sticky traps to help keep your houseplants healthy.

What to do first if you find pests

If you spot bugs, sticky residue, webbing or unusual marks on your plant, don't panic.

Start with these steps:

• Isolate the plant away from the rest of your collection
• Check nearby plants, especially those touching or close by
• Remove badly damaged leaves with clean scissors
• Wipe or shower the plant to remove as many pests as possible
• Repeat treatment regularly, as most pests are not solved in one go

Good to know: most plant pest treatments need to be repeated weekly for several weeks to break the lifecycle.

Thrips

Thrips are one of the most frustrating houseplant pests because they can be difficult to spot at first. Adults are tiny, narrow insects, often brown, black or yellowish, while the younger stages can appear pale cream or yellow.

Signs of thrips

• Silvery or dull patches on leaves
• Tiny black specks of waste on the leaf surface
• Distorted new growth
• Flower buds failing or looking damaged
• Leaves looking tired, faded or marked

How to treat thrips

Isolate the plant straight away and rinse the leaves thoroughly. Wipe down the top and underside of the leaves, then spray the whole plant with SB Invigorator Spray, paying particular attention to new growth, leaf joints and the undersides of leaves.

Repeat weekly until there are no further signs of damage. Remove heavily damaged leaves where needed.

Worth knowing: thrips can be persistent. One treatment is rarely enough.

Spider Mites

Spider mites are tiny arachnids that often appear in warm, dry conditions. They usually live on the undersides of leaves and can spread quickly if left untreated.

Signs of spider mites

• Fine webbing around leaves or stems
• Tiny pale dots or speckling on leaves
• Leaves looking dry, faded or dusty
• Yellowing leaves
• Leaf drop in severe cases

How to treat spider mites

Isolate the plant and shower the foliage with room temperature water, focusing on the undersides of the leaves. Wipe down leaves and stems, then apply SB Invigorator Spray.

Spider mites dislike humidity, so improving humidity around the plant can help slow them down. Keep the plant away from radiators and very dry, hot spots.

Top tip: if you see visible webbing, prune away the worst affected areas before treating.

Mealybugs

Mealybugs are small, white, waxy pests that often hide in sheltered parts of the plant. They are commonly found in leaf joints, along stems, beneath leaves and in tight crevices.

Signs of mealybugs

• White cottony clusters
• Sticky residue on leaves or nearby surfaces
• Sooty mould forming on sticky areas
• Weak, distorted or yellowing growth
• Small white bugs tucked into leaf joints

How to treat mealybugs

First isolate the plant. Remove visible bugs using a cotton bud or soft cloth, then wipe down the leaves and stems. Spray thoroughly with SB Invigorator Spray, making sure you reach hidden areas where mealybugs like to shelter.

Repeat weekly and keep checking crevices. Mealybugs can be stubborn because their waxy coating helps protect them.

Scale Insects

Scale insects often look like small brown, beige or black bumps stuck to stems and leaves. They can be easy to miss because they do not always look like insects at first glance.

Signs of scale

• Hard or waxy bumps on stems or leaves
• Sticky honeydew on leaves
• Sooty mould on sticky areas
• Yellowing or weakened growth
• Leaves looking dull or tired

How to treat scale

Scale insects have a protective shell, so sprays alone may not be enough. Wipe or gently scrape off visible scale with a cloth or cotton bud, then treat the plant with SB Invigorator Spray.

Check weekly and repeat treatment until no new scale appears.

Aphids

Aphids are soft-bodied insects that can be green, black, brown, pink or orange. They are more common outdoors but can also appear on houseplants, especially soft new growth and flowering plants.

Signs of aphids

• Clusters of small soft-bodied insects
• Sticky honeydew
• Distorted new growth
• Flower buds failing to open properly
• Sooty mould on sticky leaves

How to treat aphids

Isolate the plant and shower off as many aphids as possible. Wipe the leaves and stems, then treat with SB Invigorator Spray or Pepin Neem Oil.

Repeat regularly and pay attention to new growth, where aphids often gather.

Fungus Gnats

Fungus gnats are the tiny black flies you often see buzzing around the surface of houseplant compost. The adult flies are annoying, but the real issue is usually damp compost, where larvae can feed on organic matter and sometimes young roots.

Signs of fungus gnats

• Tiny black flies around your plants
• Flies appearing when you water
• Compost staying wet for too long
• Seedlings or young plants struggling

How to treat fungus gnats

Let the top layer of compost dry more between waterings and avoid keeping plants constantly damp. Use fungus gnat sticky traps to catch adult flies and monitor the infestation.

For more detailed advice, read our dedicated guide to fighting fungus gnats.

Good to know: fungus gnats are often a sign that the compost is staying too wet.

Can Neem Oil Help with Plant Pests?

Pepin Neem Oil can be useful as part of a wider pest care routine, especially when used consistently and correctly. Always follow the instructions and avoid applying oils in strong direct sun, as this can damage leaves.

As with most plant pest treatments, consistency is key. One application is unlikely to solve an infestation completely.

When should you give up on a plant?

This is not always the answer people want, but sometimes the kindest and most practical option is to let a plant go.

If a plant is very badly infested, severely weakened or repeatedly spreading pests to the rest of your collection, it may be better to dispose of it and protect your healthier plants.

Worth knowing: a small, inexpensive plant with a severe pest outbreak can sometimes cost more in time, stress and treatment than it is worth saving.

Frequently Asked Questions

What are the most common houseplant pests?

The most common houseplant pests include thrips, spider mites, mealybugs, scale insects, aphids and fungus gnats.

Should I isolate a plant with pests?

Yes. Always isolate an affected plant as soon as you notice pests to reduce the risk of them spreading to nearby plants.

How often should I treat houseplant pests?

Most treatments need to be repeated weekly for several weeks. This helps catch newly hatched pests and break the lifecycle.

Can plant pests spread to other houseplants?

Yes. Many pests can spread through direct contact, air movement, clothing or by moving plants around the home.

Are sticky traps enough to get rid of fungus gnats?

Sticky traps are useful for catching adult flies, but you also need to adjust watering and allow the top layer of compost to dry more between waterings.

Your Houseplant Pest Checklist

• Isolate affected plants straight away
• Check nearby plants carefully
• Remove heavily damaged leaves where needed
• Wipe or shower the plant before spraying
• Treat the tops and undersides of leaves
• Repeat treatment weekly
• Keep monitoring even after pests seem to have gone
• Adjust watering if fungus gnats are present

Keep Plant Pests Under Control

Plant pests are frustrating, but they are also very common. The key is to catch them early, isolate the affected plant and repeat treatment consistently.

Browse our SB Invigorator Spray, Pepin Neem Oil and fungus gnat sticky traps to help tackle common houseplant pests.