Most gardeners have heard of joint planting, or growing certain crops for mutual benefit. Many beneficial cultivations are based on observation and folklore, although preliminary research suggests there may be some truth to this age-old practice. Some studies show limited effects, such as planting African marigolds near tomatoes to catch pests like aphids or basil to help tomatoes grow stronger.
Another aspect of cooperation is that some crops may not be planted together. While there is a lot of research showing that some plants don't "like" each other, sometimes plants do better when they aren't grown together. This is especially true when these plants must compete for water and nutrients, or both attract the same pests or diseases that can damage both plants, for example.
If nothing else, there's certainly no harm in experimenting with planting principles in your own backyard. Since every garden is different in terms of microclimate, nutrient requirements and weather conditions, you will need to pay attention to the results to determine what works best.
Some recommendations for plants that should not be planted together:
Tomatoes and corn
Tomatoes and corn attract the same pests as tomato fruit caterpillars, so these insects can damage both crops if infected.
Cucumbers and potatoes
These plants compete for the same types of nutrients, so it's best to give each one space. They can also be infected with cucumber mosaic virus, which cannot be chemically controlled.
Black walnut trees and most other plants
The black walnut tree ( Juglans nigra ) contains a chemical called juglone that kills the plant's roots to reduce competition. Once in the soil, these chemicals can harm annuals, garden vegetables, fruit trees and some perennials. If you grow black walnuts on your property, don't expect to grow a vegetable garden around it, as greens like tomatoes and peppers are particularly susceptible. But everything looks good with herbs.
Tomatoes and eggplants
Tomatoes and eggplant attract worms. Planting too close together provides some protection against this pest, which can result in the loss of both plants.
Garlic and onion
Garlic is more susceptible to onion diseases, such as pests. Give them both a fighting chance and don't plant them together or in the same spot year after year.
Cabbage and other cruciferous vegetables
Cabbage and other cruciferous vegetables such as broccoli, cabbage, collard greens and mustard greens can be damaged by keeping cabbage in the refrigerator. Some gardeners say that growing more cruciferous vegetables attracts more pests. A greater variety of plants can reduce the risk of losing everything if these unwanted insects show up.
Subscribe to our mailing list for more Southern Living news!
Read original articles about life in the South.
