Companion Planting Reference Guide
How to Select Companion Plants for Your Garden Tower® 2 Planting System
Companion planting allows you to select plants that benefit each other in different ways. Moreover, many common garden plants have allelopathic effects. This means they can slow the growth of certain types of neighboring plants!
The composting vertical Garden Tower® 2 planting system is the definition of a companion planting system. 50 plants in 4 square feet at six elevations guarantees plant-to-plant interactions at both the stem and root levels.
Infographic for Reference
Here’s a fantastic infographic for determining which vegetables will thrive near each other and which veggies you need to put a little space between:
Infographic courtesy of Afristar Foundation
Afristar Foundation develops educational resources for schools, community programs and adult education in the form of posters, educational documentaries and informational booklets. We make use of accessible media to illustrate techniques and principles of sustainability and to spread information in a manner that is fun, colorful and easy to understand. To learn more visit http://afristarfoundation.org/.
Tables to Reference for Plant Selections
The following tables offer valuable insights for plant selection and design in a Garden Tower® 2 planting system or conventional garden.
Determine what plant(s) you would like to grow, check the table to learn which companion plants will help your desired plant thrive and which plants you should avoid planting adjacent to it! Don’t be intimidated, it’s simpler than it looks!
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|Common name||Scientific name
|Alliums||Allium||fruit trees, nightshades (tomatoes, capsicum peppers, potatoes), brassicas (cabbage, broccoli, kohlrabi, etc.) carrots||carrots||slugs, aphids, carrot fly, cabbage worms||beans, peas, parsley||Alliums include onions, garlic, leeks, shallots, chives, and others|
|Asparagus||Asparagus officinalis||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||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||Brassica oleracea||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 graveolens||Cosmos, Daisies, Snapdragons||corn, Aster flowers, these can transmit the aster yellows disease|
|Corn / Maize||Zea mays||beans||Sunflowers, legumes (beans, peas, etc.), peanuts, cucurbits (squash, cucumbers, melons, etc.), amaranth, white geranium, lamb’s quarters, morning glory, parsley, and potato ||Tomato, Celery||Provides beans with a trellis, is protected from predators and dryness by cucurbits, in the three sisters technique|
|Cucumber||Cucumis Sativus||Nasturtiums, radishes, marigolds, sunflowers, peas, beets, carrots, and Dill||Beneficial for ground beetles||Tomato, Sage|
|Common name||Scientific name||Helps||Helped by||Attracts||Repels||Avoid||Comments|
|Eggplant or Aubergine||Solanum melongena||Beans, Peppers||Marigolds, tarragon, mints||Marigolds will deter nematodes.|
|Leek||Allium ampeloprasum v. porrum||Celery, apple trees||carrots||cabbage worms, aphids, carrot fly, others||Legumes (beans, peas, etc.), Swiss chard||Same companion traits as all alliums (onions, garlic, shallots, chives, etc.)|
|Lettuce||Lactuca sativa||Radish, Kohlrabi, beans, carrots||celery, cabbage, cress, parsley||Mints (including hyssop, sage, and various “balms”) repel slugs, a bane of lettuce and cabbages|
|Mustard||Brassicaceae, Sinapis alba||Cabbage, cauliflower, radish, Brussels sprouts, turnips||various pests||Same general companion profile as all brassica (cabbage, kohlrabi, Brussels sprouts, cauliflower, etc.)|
|Nightshades||Solanaceae||carrots, alliums, mints (basil, oregano, etc.)||beans, black walnuts, corn, fennel, dill, brassica (broccoli, cabbage, cauliflower, etc.)||Nightshade plants include tomatoes, tobacco, chili peppers (including bell peppers), potatoes, eggplant, and others|
|Common name||Scientific name||Helps||Helped by||Attracts||Repels||Avoid||Comments|
|Onion||Allium cepa||Tomatoes, brassicas (broccoli, cabbage, etc.)||Carrots||aphids, carrot fly, other pests||Beans, lentils, peas, parsley||Same companion traits as all other alliums (chives, garlic, shallots, leeks, etc.)|
|Peppers||Solanaceae, Capsicum||themselves, marjoram||tomatoes, geraniums, petunias||Tomato Hornworm||beans, kale (cabbage, Brussels sprouts, etc.)||Pepper plants like high humidity, which can be helped along by planting with some kind of dense-leaf companion, like marjoram and basil; they also need direct sunlight, but their fruit can be harmed by it…pepper plants grown together, or with tomatoes, can shelter the fruit from sunlight, and raises the humidity level.|
|Potato||Solanum tuberosum||Horseradish||Atriplex, carrot, cucumber, onion, raspberries, squash, sunflower, tomato||Horseradish increases the disease resistance of potatoes|
|Parsnip||Pastinaca Sativa||fruit trees||a variety of predatory insects|| The flowers of the parsnip plant left to seed will attract a variety of predatory insects to the garden, they are particularly helpful when left under fruit trees, the predators attacking codling moth and light brown apple moth. The root also contains Myristricin, which is toxic to fruit flies, house flies, red spider mite, pea aphids.
|Pumpkin and other Squash||Curcurbita spp||corn, beans||Buckwheat, catnip, tansy, radishes||Spiders, Ground Beetles||Radishes can be used as a trap crop against flea beetles, Curcurbita can be used in the three sisters technique|
|Radish||Rafanus Sativus||squash, eggplant, cucumber, lettuce||flea beetles, cucumber beetles||Radishes can be used as a trap crop against flea beetles|
|Spinach||Spinacia oleracea||Peas, Beans||The peas and beans provide natural shade for the spinach|
|Tomatoes||Solanum lycopersicum||roses, peppers, asparagus||basil, oregano, parsley, carrots, marigold, Alliums, celery, Geraniums, Petunias, Nasturtium, Borage, any type of onion or chives||Tomato Hornworm||asparagus beetle||Black walnut, corn, fennel, peas, dill, potatoes, beetroot, brassicas (kohlrabi, cabbage, etc.), rosemary||
Dill attracts tomato hornworm.
Growing basil 10 inches apart from tomatoes can increase the yield of tomatoes by about 20%.
- Sally Jean Cunnigham (1998). “Great Garden Companions”, ISBN 0-87596-847-3
- The Rodale Herb Book, Eighth Printing, c1974, ISBN 0-87857-076-4
- Companion Planting Guide, Ute Bohnsack 
- Companion Planting
- Companion plants by Professor Stuart B. Hill Department of Entomology Macdonald College
- DGS Gardening companion plant list
- Cass County Extension Companion Planting List