may provide: Nitrogen, Nutrients, Mulch, Pollination, and Protection-both from competition and pests. 



cabbage:hyssop



avender is good planted next to most veggies, as it attracts bees which then help with pollination. Dill, fennel 

and sunflowers all attract pest-eating ladybugs; parsley and thyme attract tachinid flies, which act as parasites 

to a number of garden pests.

Read more at Suite101: Introduction to the Rules of Companion Planting: Basic Principles for Grouping Plants for 

Better Growth and Yield 

http://vegetablegardens.suite101.com/article.cfm/introduction_to_the_rules_of_companion_planting#ixzz0yXDqQu8g

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Dill and nasturtiums both make good companions for squash and cucumber because they repel squash bugs and attract beneficial insects.
Sweet corn does well with potatoes, peas, pumpkins and squash (corn, legumes, & squash are the traditional "Three Sisters").
Sow two or three radish seeds in cucumber hills to protect against cucumber beetles. Do not pull the radishes, but let them grow as long as they will.
Lettuce grows well with strawberries, cucumbers and carrots.
Pumpkins grow well with corn, but pumpkins and potatoes have an inhibiting effect on each other.
Because of its saponin content, spinach is a useful pre-crop and does well planted with strawberries.
Tomatoes dislike cabbage, potatoes and fennel, but will protect asparagus.

http://www.mymotherlode.com/news/local/1106800/Your-Own-Vegetable-Garden-of-Eden-Companion-Planting.html


http://www.tinkersgardens.com/vegetables/companionplanting.asp
http://www.ghorganics.com/page2.html
http://colleenscorner.com/Cplants2.html
http://www.gardenguides.com/TipsandTechniques/vcomp.htm
http://www.humeseeds.com/comp1.htm