How close to broccoli and cauliflower do marigolds need to be effective at preventing worms?

I have been told that merrigolds, when planted near borccoli and califlower, will reduce worms in the broccoli and califlower. Is this true and if so how close do the merrigolds need to be planted to the broccoli and califlower?

How close to broccoli and cauliflower do marigolds need to be effective at preventing worms?
Save your money. It doesn't work.
Reply:No its not true i am afraid only spraying them will get rid of the infestation but as i do soak broccoli in salted and a little vinegar to get the creepie crawlies out
Reply:Actually, Marigolds DO make good companion plants and have been used in this way for hundreds of years. You can use either Calendula (Pot Marigold) or Tagetes (French/African Marigold) although Mexican Marigold is the best to use (has the most pungent leaves.). Plant Marigolds about 1 foot away from vegetables and make sure you have good sized Marigolds in place before you put your little veg seedlings in place. Allow 3-4 Marigolds for every veg plant, spaced evenly around the veg plant or plant alternate rows of marigolds and vegetables (best method). Marigold is great for repelling many insects, particularly nematode worms (an enemy of potatoes), aphids, carrot root fly and many other insect predators. They also look great when in flower around your veggies.

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