Good Companions, A guide to gardening with Plants that Help each other, by Bob Flowerdew published 1995 by Barnes & Noble Book
It is ABC order so will do some of the common plants to plant together and the reason why.
These members of the onion family, related to the lilies, form bulbs, most of which are used for culinary purposes-onions, leeks, shallots, garlic, and chives. They have a strong smell which can help hid other plants from pests as they accumulate super, they also have a long term fungicidal effect. Chives are often grown in a ring under fruit trees and roses for this purpose, hiding the lower stems into the bargain. Reputed to repel moles ( you should be so lucky) they are among the most effective companions for many plants especially carrots, but should be kept well away from any beans.
Apples are grown everywhere so are vulnerable to many pests and diseases. they are protected against scab alliums, especially garlic or chives, planted in a ring underneath. Nasturtiums participle the trailing varieties, discourage America apple blight or wooly aphis if they are grown near apples every year, so that the trees absorb the repellent flavors of the nasturtiums. Lay apples on dried nettles to preserve and ripen them.
All beans are leguminous and should be grown more as they enrich the soil with nitrogen fixed from the air. In general they do not thrive with the onion famil but do well mutually with carrots, brassicas and beets, they also help cucumbers. They may be grown with borage, potatoes, squashes, strawberries or tomatoes and a great boom to sweet corn and cereals, providing the nitrogen these crave. Marigolds will protect beans against the Mexican bean beetle, as will potatoes.
Many associated plants make up this genus. Red, yellow, and sugar beet are very closely related to leaf beet, perpetual spinach and Swiss chard. They are all good mineral accumulators, one quarter of the mineral content which is extremely valuable when added to compost. They do well growing with most beans, though not with runners. They like to grow with lettuce, onions and brassicas, especially kohlrabi. Birds love the leaves of all the beet family and growing them under beans or brassicas will help hide them while they are small and tender. More later in the blog. Let me know if you want to know more about companion planting. Till next time, this is Becky Litterer from Becky's Greenhouse, Dougherty, Iowa