How to Get Rid of Aphids Naturally: 8 Ways That Actually Work
One day your roses look perfectly happy. A few days later, their newest buds are crawling with tiny green insects, the leaves feel sticky, and the fresh growth is starting to curl.
Aphids. Again.
You don’t need harsh pesticides to get them under control. To get rid of aphids naturally, start by washing them off with a firm stream of water. Use insecticidal soap for stubborn colonies, deal with ants protecting them, and encourage beneficial insects to help prevent another outbreak.
Don’t worry about finding every last one, either. A few aphids on a healthy, established plant rarely cause serious trouble. It’s the growing colonies and damaged new shoots that need attention.
Quick Take: Which Natural Aphid Treatment Should You Try?
The right treatment depends on what you’re seeing. Here’s a handy way to decide.
| What You’re Seeing | Best First Move | What to Do Next |
|---|---|---|
| A few aphids on healthy plants | Leave them alone or rinse them off | Check again in a few days |
| Clusters on stems or leaf undersides | Blast them off with water | Repeat if they return |
| Heavy colonies on tender growth | Water first, then labeled insecticidal soap | Remove badly curled tips |
| Aphids with lots of ants | Remove aphids and interrupt ant access | Encourage natural predators |
| Aphids returning repeatedly | Check for ants and excessive soft growth | Support beneficial insects |
| Persistent infestations | Consider targeted biological controls or labeled horticultural products | Monitor before treating again |
For a small outbreak, there’s usually no need to bring out the sprays. A hose and a few minutes checking the undersides of leaves will often do the job.
What You’ll Need Before You Begin
You probably have most of this in your gardening supplies already.
- Garden hose with an adjustable nozzle: For washing aphids off stems and leaves.
- Clean spray bottle or pump sprayer: For applying insecticidal soap.
- Commercial insecticidal soap: Choose one labeled for aphids and the plants you’re treating.
- Pruning snips and gloves: For removing badly infested shoots.
- Bucket or sealable bag: To collect infested cuttings.
- Ant-control supplies: Protective tree wrap and a suitable sticky barrier if ants are involved.
- Optional hand lens: Handy for identifying tiny pests and beneficial insects.
There’s no need to buy everything at once. If you’ve caught the aphids early, the hose may be all you need.
Step 1: Check Your Plants and See How Bad the Aphid Problem Is
Start by turning over a few leaves. Aphids tend to gather where plants are putting on fresh growth, and a quick glance from above can miss quite a lot.
What Do Aphids Look Like?
They’re small, soft-bodied, pear-shaped insects. Depending on the species, you might find green, black, yellow, brown, or reddish ones.
Look closely around flower buds, young shoots, stem joints, and leaf undersides.
Signs of an infestation include:
- Clusters of tiny insects along tender stems
- Curling or distorted young leaves
- Sticky residue on the foliage
- Ants repeatedly visiting affected shoots
- Black sooty mold growing on sticky surfaces
The sticky stuff is called honeydew. Aphids produce it while feeding on plant sap, and ants are particularly fond of it.
A plant can look perfectly healthy from above while the undersides of its newest leaves are covered in aphids. It’s worth checking those hidden spots before deciding how much treatment is needed.
Is the Infestation Serious?
A handful of aphids on a mature rosebush usually isn’t a crisis. The plant can often cope while natural predators catch up.
It’s a different story if several growing tips are crowded with insects, the leaves are twisting, or a young seedling is beginning to struggle.
Step 2: Blast Aphids Off With Water
For most small infestations, plain water is the best starting point.
Aphids reproduce quickly, but a controlled stream from the hose can knock large numbers off before they’ve caused much damage.
Give the Plant a Thorough Rinse
Adjust the nozzle to a firm spray and work around the affected shoots. Angle the water upward so it reaches the undersides of leaves.
Spraying only from above leaves plenty of aphids untouched.
Established roses and other sturdy plants can usually handle a reasonably strong rinse. With basil, seedlings, or fragile new stems, lower the pressure and support the plant with your free hand.
You want to remove the insects, not knock the plant sideways.
Check Again Tomorrow
One rinse may clear a small colony. If aphids are still gathering around the newest shoots the next day, wash those areas again.
Several rinses over a few days may be needed.
Say three or four rosebuds are covered in green aphids. Rather than spraying the entire rosebush, hold the affected stems steady and rinse those clusters thoroughly.
Check the same buds the following morning. If only a few aphids have returned, another quick rinse may be enough.
Sometimes the stems look completely clear, then another cluster turns up two mornings later. It’s frustrating, especially when you thought you’d finished the job. But a few survivors or newcomers can start another colony surprisingly quickly.
If repeated rinsing isn’t keeping them under control, insecticidal soap is worth considering.
Step 3: Use Insecticidal Soap When Water Isn’t Enough
Stubborn aphid colonies can cling to new growth despite your best efforts with the hose.
It’s tempting to reach for the dish soap under the kitchen sink. Leave that for the dishes.
A properly formulated insecticidal soap is a more reliable choice for treating exposed aphids on garden plants.
Choose a Soap Designed for Gardening
Look for a product containing potassium salts of fatty acids and labeled for use against aphids.
Insecticidal soap works when it makes direct contact with susceptible pests. Once dry, it has little residual insecticidal activity, so it won’t keep killing aphids that arrive later.
For a handful of affected plants, a ready-to-use product is convenient. There’s no measuring or mixing, and you can concentrate on the shoots that actually need treatment.
Ordinary dish detergents may contain degreasers or other additives that damage foliage. Even pure Castile soap isn’t automatically safe for every plant.
Oregon State University Extension recommends commercially formulated insecticidal soaps because they’ve been tested for plant use and are safer than homemade versions.
Spray the Aphids, Not Everything Around Them
Follow the product label for dilution, application timing, and repeat treatments. Test a small area first if the label recommends it.
Aim at the aphid colonies, including those under leaves and along tender stems. Keep the spray away from open flowers and beneficial insects.
Cooler conditions are generally preferable, provided they meet the label instructions. Avoid spraying plants already stressed by heat or lack of water.
What if the Aphids Come Back?
Check the treated shoots over the next few days. If live aphids remain, repeat treatment only as permitted by the label.
Many common aphid species give birth to live young without mating. That rapid reproduction explains why colonies can rebuild so quickly.
There’s another reason some treatments disappoint: deeply curled leaves shelter aphids from sprays that work only on contact.
Step 4: Deal With Ants That Protect Aphids
If aphids keep returning, spend a minute watching for ants.
Those little insects marching up and down the stems may be helping the colonies survive.
Aphids produce sugary honeydew, which attracts ants. Some ant species go a step further and actively defend aphid colonies from ladybugs and other predators.
It’s quite an arrangement. The ants get food, and the aphids get protection.
Follow the Ant Trails
Watch where the ants go. If they repeatedly visit aphid-covered shoots, they may be tending the colony rather than simply passing through.
That can make it difficult for natural predators to reduce aphid numbers.
Block Their Route
On suitable woody shrubs and trees, a sticky barrier can prevent ants from climbing the trunk.
Place an appropriate protective wrap beneath the sticky material. Applying sticky products directly to sensitive bark can cause damage.
Check the barrier regularly so it doesn’t become too tight or collect debris. Also look for branches touching fences, walls, or other plants. Ants can use those as alternative routes.
If ant activity remains a serious problem, an appropriately labeled outdoor bait station may help. Follow the product directions and keep bait inaccessible to children, pets, and wildlife.
You don’t need to eliminate every ant in the garden. The aim is to reduce the ants protecting aphid colonies.
The University of California’s Integrated Pest Management program also recommends keeping ants off affected plants so natural enemies can work more effectively.
Watch for improvement: Fewer ants visiting the shoots and more beneficial insects feeding among the remaining aphids are encouraging signs.
Step 5: Prune Off the Worst-Infested Growth
Some growing tips become so tightly curled that no amount of careful spraying reaches the aphids tucked inside.
At that point, a pair of pruning snips can save a lot of trouble.
What Should You Cut?
Concentrate on severely twisted shoots, badly damaged buds, and leaves packed with aphids.
Use clean snips and put the cuttings straight into a sealable bag or suitable disposal container.
With soft herbs such as basil or mint, you can often pinch off an affected tip using your fingers.
Don’t strip away healthy growth unnecessarily, though. A plant that’s lost too much foliage may struggle more than one carrying a few aphids.
After pruning, rinse any exposed insects from the remaining stems.
Step 6: Try Nasturtiums as Aphid Trap Crops
Nasturtiums are easy to love. They spill over pots, fill awkward gaps, and produce cheerful edible flowers.
Unfortunately, certain aphids like them too.
In some gardens, that can be turned to your advantage.
How Trap Crops Work
A trap crop is grown to attract a particular pest away from another plant.
Some aphid species may settle on nasturtiums, making the colonies easier to spot and manage.
The important word is some. Different aphids prefer different host plants, and nasturtiums won’t reliably protect every vegetable or flower growing nearby.
Keep the Trap Crop Under Control
Plant nasturtiums separately from the crops you’re protecting, somewhere you can reach them easily with the hose.
Check both plantings regularly.
If the nasturtiums become heavily infested, wash off the aphids, remove affected growth, or replace the plants if necessary. An unmanaged trap crop can end up supporting more pests.
Suppose aphids repeatedly gather on tender vegetable shoots. Try a separate patch of nasturtiums nearby and watch where the insects establish themselves.
If aphids concentrate on the nasturtiums, you may have a useful trap crop. If they ignore them, there’s no point relying on the strategy.
Nasturtiums are worth experimenting with, but they shouldn’t replace the basic methods that are already working.
Step 7: Encourage the Insects That Eat Aphids
Finding ladybug larvae among your aphids is a welcome sight.
They can search through stems and leaves for prey, including places that are awkward to reach with a spray.
Ladybugs aren’t the only helpers. Lacewing larvae, hoverfly larvae, and tiny parasitic wasps also play an important part in keeping aphid populations down.
Make Your Garden Worth Visiting
Many beneficial insects need nectar, pollen, or shelter as well as insect prey.
Small-flowered plants can help provide that food.
Good choices include:
- Sweet alyssum
- Yarrow
- Flowering dill
- Buckwheat
- Cosmos
Try to keep something flowering through much of the growing season. A little organic mulch and some undisturbed garden corners can also provide useful shelter.
Avoid broad-spectrum insecticides whenever possible. They may kill the predators you want to encourage.
Learn to Recognize the Helpers
Not every unfamiliar insect crawling around your plants is a pest.
| Beneficial Insect | What You’ll Notice | Why It Helps |
|---|---|---|
| Lady beetles |