Beans and Legumes Organic Nitrogen
For nitrogen fixation, with very few exceptions, beans are best and indeed, all leguminous plants.
Beans, in particular, are compatible with most plants, although the
allium family is highly antagonistic. Try it. Plant beans next to
garlic – and watch them sulk.
In the legume family, that of broad-beans, or fava-beans, is probably
the best nitrogen [...]