Companion Planting - Master Gardeners, Cass County, North Dakota
Cass County Extension Companion PlantingIn the following listing, companions refer to those vegetables that, when planted together, are mutually beneficial. Alliesare the herbs and flowers that provide protection or improve the growth of certain vegetables. Enemies are othervegetables, herbs and flowers that can cause detrimental effects when planted near certain vegetables.This listing explains in detail the exact effects of the allies and enemies, and names the companions. ASPARAGUSCompanions: Basil, parsley, tomato. Ally: Pot marigold deters beetles. BEANSCompanions: Beet (to bush beans only), cabbagefamily, carrot, celery, chard, corn, cucumber, eggplant, Allies: Marigold deters Mexican bean beetles.pea, potatoes, radish, strawberry. Nasturtium and rosemary deter bean beetles. Summer savory deters bean beetles, improves growthEnemies: Garlic, onion and shallot stunt the growth of and flavor.beans. BEETSCompanions: Bush beans, cabbage family, lettuce,onion Enemies: Pole beans and beets stunt each others growth.Ally: Garlic improves growth and flavor. CABBAGE FAMILY (Broccoli, Brussels sprouts, cabbage, cauliflower, Chinese cabbage, kale and kohlrabi)Companions: Beet, celery, chard, cucumber, lettuce, Nasturtium deters bugs, beetles, aphids.onion, potato, spinach. Southernwood deters cabbage moth, improves growth and flavor.Allies: Chamomile and garlic improve growth and flavor. Tansy deters cabbageworm and cutworm.Catnip, hyssop, rosemary and sage deter cabbage Thyme deters cabbageworm.moth.Dill improves growth and health. Enemies: Kohlrabi and tomato stunt each othersMint deters cabbage moth and ants, improves health growth.and flavor. CARROTS
Allies: Chives improve growth and flavor.Companions: Bean, lettuce, onion, pea, pepper, radish, Rosemary and sage deter carrot fly.tomato Enemy: Dill retards growth. CELERY Allies: Chives and garlic deter aphids.Companions: Bean, cabbage family and tomato Nasturtium deters bugs and aphids. CHARDCompanions: Bean, cabbage family and onion CORNCompanions: Bean, cucumber, melon, parsley, pea, Allies: Odorless marigold and white geranium deterpotato, pumpkin, squash Japanese beetles. Pigweed raises nutrients from the subsoil to where theEnemies: Tomatoes and corn are attacked by the same corn can reach them.worm. CUCUMBER Allies: Marigold deters beetles.Companions: Bean, cabbage family, corn, pea, radish, Nasturtium deters aphids, beetles and bugs, improvestomato growth and flavor. Oregano deters pests in general.Enemy: Sage is generally injurious to cucumber. Tansy deters ants, beetles, bugs, flying insects. EGGPLANTCompanions: Bean, pepper Allies: Marigold deters nematodes. LETTUCECompanions: Beet, cabbage family, carrot, onion, Allies: Chives and garlic deter aphids.radish, strawberry MELONS Allies: Marigold deters beetles.Companions: Corn, pumpkin, radish, squash Nasturtium deters bugs and beetles. Oregano provides general pest protection ONlONS Allies: Chamomile and summer savory improve growthCompanions: Beet, cabbage family, carrot, chard, and flavor.lettuce, pepper, strawberry, tomato Pigweed raises nutrients from subsoil and makes them available to the onions.Enemies: Onions stunt bean, pea. Sow thistle improves growth and health.
PARSLEYCompanions: Asparagus, corn, tomato PEAS Allies: Chives deter aphids.Companions: Bean, carrot, corn, cucumber, radish, Mint improves health and flavor.turnip Enemies: Garlic and onion stunt the growth of peas. PEPPERSCompanions: Carrot, eggplant, onion and tomato POTATOESCompanions: Beans, cabbage family, corn, eggplant,pea Allies: Horseradish, planted at the corners of the potato patch, provides general protection.Enemies: Tomatoes and potatoes are attacked by the Marigold deters beetles.same blight. PUMPKINS Allies: Marigold deters beetles.Companions: Corn, melon, squash Nasturtium deters bugs, beetles. Oregano provides general pest protection. RADISHES Allies: Chervil and nasturtium improve growth andCompanions: Bean, carrot, cucumber, lettuce, melon, flavor.pea Enemy: Hyssop SPINACHCompanions: Cabbage family, strawberry SQUASHCompanions: Corn, melon, pumpkin Marigold deters beetles. Nasturtium deters squash bugs and beetles.Allies: Borage deters worms, improves growth and Oregano provides general pest protection.flavor. STRAWBERRYCompanions: Bean, lettuce, onion, spinach, thyme Allies: Borage strengthens resistance to insects and disease.Enemy: Cabbage Thyme, as a border, deters worms.
TOMATOES Allies: Basil repels flies and mosquitoes, improvesCompanions: Asparagus, carrot, celery, cucumber, growth and flavor.onion, parsley, pepper Bee balm, chives and mint improve health and flavor. Borage deters tomato worm, improves growth andEnemies: Corn and tomato are attacked by the same flavor.worm. Dill, until mature, improves growth and health. OnceMature dill retards tomato growth. mature, it stunts tomato growth.Kohlrabi stunts tomato growth. Marigold deters nematodes.Potatoes and tomatoes are attacked by the same blight. Pot marigold deters tomato worm and general garden pests, TURNIPSCompanion: Pea This page was last updated May 2002 Todd Weinmann, Extension Horticulturist & Master Gardener Coordinator Phone: (701) 241-5707 E-mail: email@example.comGo to VegetablesGo to Horticulture Page