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Insect Control

Companion planting for repelling insects

What is companion planting?

Some plants do better when in the company of other plants. Companion planting is using this knowledge to increase plant performance. Companion planting includes planting flowers, herbs or vegetables to repel or trap harmful insects. It also includes using plants to attract useful insects which prey upon harmful insects. People use companion planting as a way of reducing chemical insecticide use.

How can I companion plant?

Companion planting requires some experimentation. What may be successful in one garden may not be successful in another garden. This may be caused by different microclimates, soil types, plant varieties and cropping practices.

Plants that repel harmful insects

Ants

Tansy
Onions
Mint family

Aphids

Chives
Garlic
Marigolds
Mint family
Dried & crushed chrysanthemum flowers
Coriander
Onions
Oregano

Cabbage moths

Rosemary
Sage
Thyme

Cabbage worms

Tomatoes
Celery

Carrot flies

Leeks
Sage
Rosemary

Colorado potato beetles

Green beans
Marigolds
Nasturtiums
Flax

Cucumber beetles

Nasturtiums
Radishes
Tansy

Flea beetles

Catnip
Garlic

Flies

Basil
Tansy

Mosquitoes

Dried & crushed
Chrysanthemum flowers

Leafhoppers

Dried & crushed
Chrysanthemum flowers

Onion flies

Garlic

Plants that attract useful insects

Assassin bugs

Alfalfa
Carrot
Goldenrod

Big-eyed bugs

Alfalfa
Carrot
Goldenrod

Damsel bugs

Alfalfa

Lacewings

Carrot

Lady beetles

Alfalfa
Morning glory
Yarrow
Goldenrod

Parasitic wasps

Yarrow
White clover
Goldenrod
Carrot Alfalfa

Plants that trap harmful insects

Aphids

Nasturtium

Flea beetles

Radish
Nasturtium

Potato bugs

Egg plant


Last update: July 22, 2020
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Winnipeg MB R2L 1V2
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