PlantCompanions and Effects
AsparagusTomatoes, parsley, basil
BasilTomatoes (improves growth and flavor); repels
flies and mosquitoes.
BeansPotatoes, carrots, cucumbers, cauliflower, cabbage, summer savory, most other vegetables and herbs. Adds nitrogen to soil.
Beans(bush)Sunflowers (beans like partial shade, sunflowers attract birds and bees), cucumbers (combination of heavy and light feeders), potatoes, corn, celery, summer savory.
BeetsOnions, kohlrabi.
BorageTomatoes (attracts bees, deters tomato worm, improves growth and flavor), squash, strawberries.
Cabbage familyPotatoes, celery, dill, chamomile, sage, thyme, mint, pennyroyal, rosemary, lavender, beets, onions. Aromatic plants deter cabbage worms.
CarrotsPeas, lettuce, chives, onions, leeks, rosemary, sage, tomatoes.
CatnipPlant in borders; protects against flea beetles.
CeleryLeeks, tomatoes, bush beans, cauliflower, cabbage.
ChamomileCabbage, onions.
ChervilRadishes (improves growth and flavor).
ChivesCarrots; plant around base of fruit trees to discourage insects from climbing trunk.
CornPotatoes, peas, beans, cucumbers, pumpkin, squash.
CucumbersBeans, corn, peas, radishes, sunflowers.
DillCabbage (improves growth and health), carrots.
FennelMost plants dislike it.
FlaxCarrots, potatoes.
GarlicRoses and raspberries (deters Japanese beetle); with herbs to enhance their production of essential oils;  plant liberally throughout garden to deter pests (ex: near legumes).
HorseradishPotatoes (deters potato beetle); around plum trees to discourage curculios.
Lamb’s quartersNutritious edible weed; allow to grow in modest
amounts in the corn.
LeekOnions, celery, carrots.
LettuceCarrots and radishes (lettuce, carrots, and radishes make a strong companion team), strawberries, cucumbers.
MarigoldsThe workhorse of pest deterrents. Keep soil free of nematodes; discourages many insects. Plant freely throughout garden.
MarjoramHere and there in garden.
MintCabbage family; tomatoes; deters cabbage moth.
House fly repellent.
Mole plantDeters moles and mice if planted here and there
throughout the garden.
NasturtiumTomatoes, radishes, cabbage,, cucumbers, plant under fruit trees. Deters aphids and pest of cucurbits.
OnionBeets, strawberries, tomatoes, lettuce (protects
against slugs).
ParsleyTomato, asparagus.
PeasSquash (when squash follows peas up trellis).
plus grows well with almost any vegetable; adds
nitrogen to the soil.
PetuniaProtects beans; beneficial throughout garden.
PigweedBrings nutrients to topsoil; beneficial growing with potatoes, onions, and corn; keep well thinned.
PotatoHorseradish, beans, corn, cabbage, marigold, limas, eggplant (as trap crop for potato beetle).
Pot marigoldHelps tomato, but plant throughout garden as
deterrent to asparagus beetle, tomato worm, and
many other garden pests.
RadishPeas, nasturtium, lettuce, cucumbers; a general
aid in repelling insects.
RosemaryCarrots, beans, cabbage, sage; deters cabbage
moth, bean beetles, and carrot fly.
RueRoses and raspberries; deters Japanese beetle.
Keep it away from basil.
SageRosemary, carrots, cabbage, peas, beans; deters some insects. Not with cucumbers.
SoybeansGrows with anything; helps everything.
SquashNasturtium, corn.
StrawberriesBush beans, spinach, borage, lettuce-as a border.
Summer SavoryBeans, onions, Deters bean beetles.
TansyPlant under fruit trees; deters pests of roses and raspberries; deters flying insects; also Japanese beetles, striped cucumber beetles, squash bugs; deters ants.
TarragonGood throughout garden.
ThymeHere and there in garden; deters cabbage worm.
TomatoChives, onion, parsley, asparagus, marigold,
nasturtium, carrot, limas.
ValerianGood anywhere in garden.
WormwoodAs a border, keeps animals from the garden.
YarrowPlant along borders, near paths, near aromatic
herbs; enhances essential oil production of herbs.

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