How to Get Rid of Spider Mites on Indoor and Outdoor Plants

Key Points: How to Get Rid of Spider Mites

• Spider mites thrive in hot, dry conditions indoors and outdoors.
• Look for stippled leaves, yellowing, and fine webbing underneath foliage.
• Insecticidal soap and horticultural oil are effective DIY treatments.
• Boosting humidity and regular watering helps prevent infestations.
• A pest control pro can handle severe or recurring outbreaks.

In this article we cover:

1. What Are Spider Mites?
2. How Do You Identify Spider Mites on Your Plants?
3. Why Are Spider Mites Common in Canadian Homes and Gardens?
4. How Do You Get Rid of Spider Mites? DIY Treatment Options
5. How to Prevent Spider Mites From Coming Back
6. When Should You Call a Pest Control Professional?
7. Find a Pest Control Professional on HomeStars
8. Frequently Asked Questions About Spider Mites

What Are Spider Mites?

Spider mites are arachnids, not insects, which puts them in the same family as spiders and ticks rather than aphids or whiteflies. They are nearly invisible to the naked eye, measuring under 1 mm in length, so most homeowners only notice them once a plant is already showing damage.

The most common species affecting Canadian homes and gardens is the two-spotted spider mite (Tetranychus urticae). It feeds on over 200 plant species, from houseplants on your windowsill to fruit trees in the backyard, making it a widespread problem across many different growing situations.

What makes spider mites particularly difficult to manage is how quickly populations grow. A single female can lay dozens of eggs over a few weeks, and a full generation cycle completes in under a month. By the time the first generation hatches, those mites are already laying eggs of their own. In hot, dry conditions, numbers can swell from a minor nuisance to a serious infestation in a matter of weeks.

How Do You Identify Spider Mites on Your Plants?

Before you can treat spider mites, you need to confirm that spider mites are actually what you're dealing with. The symptoms can look similar to nutrient deficiencies or other pest damage, so a quick inspection goes a long way.

The most common early sign is stippling: tiny white or yellow dots scattered across the upper surface of leaves. These dots appear where the mites have been feeding on the underside of the leaf, puncturing individual plant cells. As the infestation grows, leaves may yellow, curl at the edges, or drop from the plant entirely.

One of the clearest signs of a larger infestation is fine, silky webbing on the undersides of leaves or stretched between stems. If you see webbing, the population has already grown significantly and treatment should start right away.

To confirm spider mites are present, try this simple test:

• Hold a sheet of white paper under a leaf and give it a firm tap
• Look closely at the paper for tiny moving specks, those are the mites
• If the specks are stationary, they may be dust or debris rather than live mites

Because spider mites thrive in hot, dry conditions, inspect your plants every few days during heat waves or dry spells outdoors. Indoors, the winter heating season is the highest-risk period, when forced-air systems drop humidity and create ideal conditions for mites on houseplants. Catching an infestation early makes treatment considerably more straightforward.

Why Are Spider Mites Common in Canadian Homes and Gardens?

Spider mites don't appear at random. In Canada, two distinct seasonal conditions create near-perfect environments for them to multiply, which is why so many homeowners deal with repeat outbreaks on both indoor plants and garden beds.

Forced-air heating is one of the biggest culprits indoors. When Canadian winters kick in and the furnace runs continuously, indoor humidity drops significantly. That dry air is exactly what spider mites on houseplants need to thrive, which is why knowing how to get rid of spider mites on indoor plants becomes especially relevant between November and March.

Outdoors, the pattern shifts to summer. Hot, dry conditions on the prairies and in southern Ontario accelerate mite reproduction, and populations can swell quickly when rainfall is scarce.

Two additional factors make the problem worse:

• Drought-stressed plants are more vulnerable because they cannot mount their natural defences against feeding mites.
• New plants from nurseries or garden centres can carry mites into your home before you notice any signs of damage.

Recognising these conditions helps you stay ahead of infestations rather than reacting after the damage is already visible.

How Do You Get Rid of Spider Mites? DIY Treatment Options

Acting quickly and choosing the right method for how far the infestation has progressed makes all the difference. The treatments below move from the gentlest approach to the more aggressive, so you can start where it makes sense for your situation.

Step one: isolate affected plants. If you're dealing with spider mites on indoor plants, move the affected plant away from the rest of your collection immediately. Mites crawl between plants that are close together, and spreading is fast once populations build.

From there, work through these treatment options in order:

• Physical removal: Wipe leaves with a damp cloth, or take the plant to a sink or shower and spray it with a strong stream of water. This dislodges mites directly and works well for light infestations. Focus on the undersides of leaves, where mites feed and hide.
• Insecticidal soap: Apply directly to the undersides of leaves, where mites concentrate. Insecticidal soap kills mites on contact and does not harm most beneficial insects. Repeat every 5 to 7 days, since a single application won't reach eggs or newly hatched mites.
• Horticultural oil: Mineral oil sprays smother mites and their eggs by coating leaf surfaces. Apply thoroughly to all leaf surfaces, including the undersides, and allow time for the oil to work before wiping or rinsing.
• Neem oil: Another option for spider mite treatment, neem oil disrupts mite development and feeding. Note that some provinces, notably Ontario, restrict cosmetic pesticide use outdoors. Check your local regulations before applying neem oil in a garden or yard setting. Health Canada's Pest Management Regulatory Agency (PMRA) maintains a registry of approved products if you want to confirm what's permitted in your area.

One important habit to build into your treatment routine: rotate between product types after every few applications. Spider mites can develop resistance to a single treatment when it's used repeatedly, so switching between insecticidal soap, horticultural oil, and neem oil keeps your approach working.

Treatment Comparison at a Glance

Treatment method	Best suited for
Damp cloth or water spray	Light infestations, large-leafed plants
Insecticidal soap	Active infestations indoors and outdoors
Horticultural oil	Moderate infestations, smothers eggs too
Neem oil	Moderate infestations (check provincial rules for outdoor use)

Consistency matters more than the product you choose. Most spider mite treatments require multiple rounds to break the life cycle, since a full generation can complete in under a month. Keep treating every 5 to 7 days until you see no new signs of activity.

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How to Prevent Spider Mites From Coming Back

Once you have dealt with an active infestation, the goal is to make your plants less inviting so spider mites don't return next season. Most outbreaks happen because conditions quietly shifted in the mites' favour, so small, consistent habits make a real difference.

For indoor plants, humidity is your first line of defence. As noted above, winter heating drops indoor humidity significantly. A humidifier near your plant collection, pebble trays filled with water beneath pots, or simply grouping plants closer together all raise the ambient moisture around foliage.

Outdoors, consistent watering during dry spells is just as important. During hot prairie summers or dry stretches in southern Ontario, keeping soil moisture steady reduces the conditions that allow mite populations to build quickly.

A few other habits worth building into your routine:

• Inspect new plants before bringing them indoors or adding them to garden beds. A single infested plant from a nursery can introduce spider mites to your entire collection.
• Encourage natural predators such as ladybugs and predatory mites in your garden by avoiding broad-spectrum pesticides, which kill beneficial insects alongside the pests.
• Prune and dispose of heavily infested leaves or branches in the garbage rather than the compost bin. Composting affected material can allow mites and eggs to survive and spread.

When Should You Call a Pest Control Professional?

DIY spider mite treatment works well for most infestations, but there are situations where it makes more sense to bring in a professional. Knowing when to make that call saves you time and money.

Consider reaching out to a pest treatment specialist if:

• Infestations keep returning despite repeated DIY treatment. Recurring outbreaks often signal a deeper problem that home remedies alone cannot resolve.
• Large outdoor infestations are affecting trees, hedges, or established shrubs. These situations may require commercial-grade equipment and products that are not available to homeowners.
• You are unsure what pest you are dealing with. A professional can confirm whether spider mites are actually the problem or whether another pest is causing the damage. Misidentifying the pest means treating for the wrong thing, which wastes time and can stress your plants further.

The cost of pest control services varies depending on the scope of the job, the size of the affected area, and your location. For a clearer picture of what to budget, review the exterminator cost guide before you start making calls.

Find a pest control professional in your area

Find a Pest Control Professional on HomeStars

If DIY treatments aren't keeping up with the infestation, HomeStars makes it straightforward to find a pest control professional in your area. Post your job for free, receive responses from interested pros, then compare profiles and reviews to find the right fit for your situation.

Browse the pest control directory to see professionals available near you, or post your job and let them come to you.

Find a pest control pro in your area

Frequently Asked Questions About Spider Mites

Can spider mites spread from plant to plant?

Yes, spider mites crawl between plants that are touching or placed close together. They can also hitch a ride on your clothing, hands, or gardening tools, which is how they move from one area of your home to another.

Isolating any affected plant immediately is the most important first step. Move it away from the rest of your collection before you start any treatment.

Are spider mites harmful to people or pets?

Spider mites are not a health risk to people or pets. They do not bite humans or animals, and they are not known to transmit any diseases. If you have children or pets around your plants, there is no cause for concern on that front. The issue with spider mites is strictly plant health.

Do spider mites survive Canadian winters outdoors?

Many spider mite species do survive Canadian winters, so a hard frost does not necessarily solve the problem. Rather than dying off, they overwinter as eggs tucked into bark crevices or buried in leaf litter, ready to hatch once temperatures rise in spring.

Clearing garden debris in fall removes those overwintering sites and gives you a meaningful head start before the next growing season begins.

What is the fastest way to get rid of spider mites on indoor plants?

For a quick result, shower the plant under lukewarm water to physically knock mites off the leaves, paying close attention to the undersides. Follow that up with a spider mite treatment using insecticidal soap, applied every 5 to 7 days until the infestation clears. This combination tackles mites at different stages and is one of the most practical approaches for clearing indoor plants without reaching for stronger products. Between treatments, boost humidity around the plant using a pebble tray or a nearby humidifier, as mites struggle to re-establish in moister air.