Certain garden plants have the ability to inhibit the growth and development of other nearby plants.
These plants are often referred to as "allelopathic" plants, and they release chemicals or compounds into the soil or surrounding environment that can suppress the growth of neighboring vegetation.
Here are some examples of allelopathic garden plants.
Black Walnut
Black walnut trees produce a compound called juglone, which is toxic to many plants, including tomatoes, potatoes, peppers, and certain fruit trees.
Sunflowers
Sunflowers release allelopathic chemicals through their roots, which can inhibit the growth of nearby plants.
Juglone-Producing Trees
Besides black walnut, other trees in the walnut family, such as hickory and butternut, also release juglone and can impact neighboring plants.
Barberry
Barberry bushes produce chemicals that can hinder the growth of nearby plants and affect soil microorganisms.
Eucalyptus
Eucalyptus trees release allelopathic compounds that can suppress the growth of many plant species in their vicinity.
Mint
Mint plants, especially invasive varieties, can inhibit the growth of other plants due to their aggressive nature and release of allelopathic compounds.
Sorghum
Sorghum is a cereal grain that produces allelopathic compounds that can inhibit the growth of nearby plants.
Rye
Rye cover crops are often used to suppress weeds, but their allelopathic effects can also impact the growth of desired garden plants.
