Onion Sets and Peas

Having just planted a row of onion sets between 2 rows of peas to save space. I have just read that you should not grow these 2 vegetables together. Is this correct and if so why?

 

Your post prombted me to do some research and I found this statement at:

http://www.ghorganics.com/page2.html

Many plants have natural substances in their roots, flowers, leaves etc. that can alternately repel (anti-feedants) and/or attract insects depending on your needs. In some situations they can also help enhance the growth rate and flavor of other varieties. Experience shows us that using companion planting through out the landscape is an important part of integrated pest management. In essence companion planting helps bring a balanced eco-system to your landscape, allowing nature to do its' job. Nature integrates a diversity of plants, insects, animals, and other organisms into every ecosystem so there is no waste. The death of one organism can create food for another, meaning symbiotic relationships all around. We consider companion planting to be a holistic concept due to the many intricate levels in which it works with the ecology. [align=left]By using companion planting, many gardeners find that they can discourage harmful pests without losing the beneficial allies. There are many varieties of herbs, flowers, etc. that can be used for companion plants. Be open to experimenting and find what works for you. Some possibilities would be using certain plants as a border, backdrop or interplanting in your flower or vegetable beds where you have specific needs. Use plants that are native to your area so the insects you want to attract already know what to look for! Plants with open cup shaped flowers are the most popular with beneficial insects.



Hope this answers your question
robert
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The only reason I can think of is the simple issue of overcrowding.

Peas grow quite big and might deprive the onions of moisture, nutrients and most important of all, sunlight. Onions need all the sunshine they can get.

 

I planted my onion sets in a raised bed alongside my peas last year. Didn't have any major problems but did have to water the bed regularly. I also planted carrots in the same bed alongside the onions after reading that onions deter carrot fly had to destroy nearly all of the carrots they got hit really bad with the little buggers.