- Although companion planting may seem more intuitive than scientific, horticulturists know that plants often modify their environments, both chemically and physically, to survive, altering the pH and moisture content of surrounding soil, the availability of nutrients and the type and amount of light available. Dr. Linda Chalker-Scott of the Puyallup Research and Extension Center at Washington State University points out that these environmental changes necessarily affect some associated species positively and others negatively. Plants interact with each other through their environment.
- Shallots are a close relative of onions, leeks, chives and garlic, all of which belong to the Allium family. Considered a hardy perennial, shallots grow well in sunny locations in well-drained, sandy loam. Shallots utilize a shallow root system, and they prefer cool temperatures and moist, but not soggy, soil. According to the Virginia Cooperative Extension, conditions such as downy mildew, neck rot and bacterial soft rot are common diseases that affect shallots. Shallots may also fall victim to infestations of onion thrips, or onion maggots.
- Plant compatibility can be based on a variety of characteristics, according to Gail Hermenau of the University of Delaware Extension. For example, plants that have similar cultural or nutrient requirements may grow well together, as will plants that make efficient use of available nutrients. Compatibility may also be based on a plant’s ability to deter pests that threaten its companions. Companion plants to shallots are the same as those of garlic and onions, according to Dale Mayer, author of “The Complete Guide to Companion Planting: Everything You Need to Know to Make Your Garden Successful.” These members of the Allium family grow well with beets, lettuce, strawberries, cabbage and tomatoes.
- In the same way that some plants make good companions, others can be referred to as incompatible. The physical and chemical changes that one plant makes on its environment may adversely affect the growth of some other species. According to Dale Mayer, shallots are not compatible with peas or beans.
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