Plants for gardens ideas

Alliums

Allium

fruit trees, nightshades (tomatoes, capsicum peppers, potatoes), brassicas (cabbage, broccoli, kohlrabi, etc.) carrots

carrots

slugs, aphids, carrot fly, cabbage worms[1]

beans, peas, parsley

Alliums include onions, garlic, leeks, shallots, chives, and others

Asparagus

Tomatoes

Aster Family flowers, Dill, Coriander, Tomatoes, Parsley, Basil, Comfrey, Marigolds

coupled with Basil seems to encourage lady bugs

Onion, Garlic, Potatoes

Brassicas

Brassica

potatoes, cereals (e.g. corn, wheat)

geraniums, dill, alliums (onions, shallots, garlic, etc.), rosemary, nasturtium, borage

wireworms

mustards, nightshades (tomatoes, peppers, etc.)

Brassicas are a family of species which include broccoli, cabbage, Brussels sprouts, kohlrabi, and cauliflower.

Beans

Phaseolus

Corn (see Three Sisters), Spinach, lettuce, rosemary, summer savory, dill, carrots, brassicas, beets, radish, strawberry and cucumbers

Eggplant, Summer savoury

California beetles

Tomatoes, chili peppers, alliums (onions, garlic, etc.), brassicas (cabbage, broccoli, etc.)

Hosts nitrogen-fixing bacteria, a good fertiliser for some plants, too much for others

Beets

Beta Vulgaris

lettuce, kohlrabi, onions and brassicas

Catnip, Garlic, Mint

Runner or pole beans[2]

Good for adding minerals to the soil through composting leaves which have up to 25% magnesium. Runner or pole beans and beets stunt each other's growth.

Broccoli

Brassica oleracea

geraniums, dill, alliums, rosemary, nasturtium, borage

mustards, Tomatoes, peppers

Rosemary repels cabbage fly, geraniums trap cabbage worms, same general companion profile as all brassica (cabbage, kohlrabi, Brussels sprouts, cauliflower, etc.)

Cabbage

geraniums, dill, alliums, rosemary

mustards, Tomatoes, peppers strawberries, and pole/runner beans

Rosemary repels cabbage flies, geraniums trap cabbage worms, same general companion profile as all brassica (cabbage, kohlrabi, Brussels sprouts, cauliflower, etc.)

Carrots

Daucus carota

Tomatoes, Alliums (onions, chives, etc.), lettuce

alliums (leeks, shallots, etc.), rosemary, wormwood, sage, beans, flax

assassin bug, lacewing, parasitic wasp, yellow jacket and other predatory wasps

Dill, parsnip, radish

Tomatoes grow better with carrots, but may stunt the carrots' growth. Beans (which are bad for tomatoes) provide the nitrogen carrots need more than some other vegetables. Aromatic companion plants repel carrot fly. Alliums inter-planted with carrots confuse onion and carrot flies.

Celery

Apium...