Onions do fine with other plants. Plant away.

For really good onion growing information visit Dixondale Farms Click near the top on their FAQS and Guides and you will learn all you need to know to grow great onions.

When I planted garlic last year, I recall having read that anything w/ a shallow root system works well among garlic.... I planted my lettuces in between garlics.

I also remember that cabbages & some cole crops do well w/ garlic... I also had broccoli by my garlic, and it was growing great, till the woodchucks feasted.

I don't think carrot would be a good idea as the deep root could interfere w/ the bulb.

But I don't know much, this is my first year growing.

Carrots are great planting with onions, mixed in the same row/block. The ombo confuses pests for both.