This list summarises some commonly held beliefs about the uses of companion plants, and basic anti-pest precautions I have coveed here before.
Firstly, slugs. Beer traps, copper bands and a good defense in building of slug hostile paths are primary.
Encourage Toads, Frogs and Hedgehogs by providing safe havens, dried cat food t attract them (this will also attract slugs so spread it away from veg beds) and shelter.
Their menu include cutworms, crickets, grubs, chafers, caterpillars, ants, moths, flies, slugs.
They are your friends, welcome and love them,be gretful if you have them.
Slugs are most active at night and are most efficient in damp conditions.
Go slug lamping at night, its fun. At dusk, go out in the garden with torch and a knife and kill them on sight, every slug you kill stops hundreds more being born
Far and away the best course of action against slugs in your garden is a simple adjustment in the watering schedule. Avoid watering your garden in the evening if you have a slug problem. Water in the morning - the surface soil will be dry by evening.
Studies show this can reduce slug damage by 80%.
Secondly, the more insidious underground pests, cutworms, leather jackets et al, especially when opening up new grass land for veggies - use supernemo - a great Irish product that I found to be outstandingly effective.
SuperNemos are an Irish made bio-control product that contains a wider range beneficial nematode species.
SuperNemos is environmentally friendly, harmless to wildlife, earthworms,bees, bumblebees, pets and kids.
It attacks only target insect pests. There is no need for masks or specialized safety equipment.
This product will control Vine Weevil, Wire worms, Strawberry Root Weevils,Carrot Fly, Weevils, Chafer Grubs, Caterpillars, Cutworms, Leatherjackets, Beetle larvae, Cabbage caterpillar's, Flea beetle, Cabbage root fly, Fungus Gnats Larvae and many more!
SuperNemos will attack its target insect species; the nematodes enter the host through body openings or by penetration of the body wall. Once inside they kill the host within 48 hours.
Now the plants and their companions:
Allium--flowering onions, chives, garlic, leek, onion and shallot
Companion to: Roses, carrots, tomato, fruit trees and other vegetables
Repel aphids, weevils, carrot flies, moles, fruit tree borers; controls rust flies; protects tomatoes against red spiders. Protects roses from black spot, mildew and aphids.
BUT is believed to inhibit growth of peas and beans.
Companion to: Tomato, asparagus
Repels aphids, flies and mites; helps control insect pests such as tomato horn worms, asparagus beetles, and disease.
Beans (Butter, green, snap, string,wax)
Companion to: Beets, carrots,cucumber, corn, aubergine, potato,strawberry
Encourage growth of companion plants. Adds nitrogen to the soil.
Companion to: Tomato, strawberry, fruit orchards
Repels tomato worms. Adds potassium, calcium and other minerals to soil. Attracts honeybees.
Companion to: Cabbage, onions
Improves growth and flavor--but plant only one plant every 150 feet or so.
Companion to: Aubergine. Fresh catnip steeped in water and sprinkled on plants will drive away flea beetles.
Companion to: Cabbage, leeks, tomato, cauliflower
Improves growth of companion plants. Repels white cabbage butterflies.
Companion to: Radish. Improves growth and flavor.
Companion to: Carrots. Improves growth and flavor.
Companion to: Vegetables. Repels aphids. Attracts bees.
Companion to: Sweetcorn, beans, peas, radish, sunflowers
Improves growth. Vines growing with corn help anchor sweetcorn.
Companion to: Cabbage. Improves growth. Blossoms attract honeybees.
Most plants dislike fennel--so plant it away from the vegetable garden.
Its foliage and flowers may attract beneficial insects.
Companion to: Cabbage, corn, roses. Repels cabbage worms.
Companion to: Potato. Encourages growth.
Companion to: Cabbage. Improves growth, deters cabbage moth.
Companion to: Carrots, celery, onions. Improves growth, repels carrot flies.
Companion to: Tomato, potato, strawberry, beans, roses
Encourages growth, deters some pests.
Discourages harmful nematodes if they are grown for several seasons in the ground in areas that have nematode infestations.
Companion to: Tomato, cabbage. Improves flavor and growth
Companion to:Cabbage, cauliflower, radish, Brussels sprouts, turnips, collards, kohlrabi
Plant mustard as a trap crop. It attracts numerous insect pests. Remove and destroy it before your main crops can be harmed.
Companion to: Cucumber, other vegetables, fruit trees.
Repels aphids,cucumber beetles and white flies.
Acts as trap crop for aphids. Repels borers near fruit trees.
Companion to: Cabbage, cauliflower, broccoli,beets, tomato, lettuce, strawberry, chamomile, summer savory
Repels aphids, weevils, carrot flies, moles, fruit tree borers; controls rust flies and some nematodes;
Protects tomatoes against red spiders. BUT is believed to inhibit growth of peas and beans.
Companion to: Broccoli, brassica's .Repels cabbage butterfly.
Companion to: Asparagus tomato, roses.
Deters asparagus beetles.Improves growth. Deters rose beetles.
Nigel from chillington hoes also informed me that parsley is related to carrots and parsnips and will not deter carrot fly and will actually be attacked by them.
Companion to: Sweetcorn
Adds nitrogen to soil for use by hungry corn plants. Grows well with carrots, turnip, radish, cucumber, beans and potatoes.
Companion to: Brussels sprouts, cabbage, other plants. Discourages ants, plant lice, cabbage maggots.
Companion to: Cucumber. Deters cucumber beetles.
Companion to: Carrots, cabbage, beans Repels carrot flies, bean beetles, cabbage moths.
Companion to: Carrots, Brassica's. Repels carrot flies, cabbage moths.
Companion to: Green beans. Improves growth, deters bean beetles.
Companion to: Cucumber, squash, roses, raspberry, blackberry.
Deters flying insects, striped cucumber beetles, ants, flies, squash.
BUT, attracts cabbage worms.
Companion to: Cabbage
Controls flea beetles, cabbage maggots, cabbage worms and white cabbage butterflies.
Companion to: Various plants Deters black flea beetles, cabbage worm butterflies. Highly Poisonous