Black walnut (Juglans nigra) and butternut (Juglans cinerea) trees produce a toxin called juglone capable of stunting or even killing susceptible plants, especially tomatoes, potatoes, alfalfa, apple, rhododendron, white pine, red pine, white birch, cinquefoil, and cotoneaster.
To find out more about walnut toxicity, including a list of plants that will tolerate or even thrive next to walnut trees, read this helpful fact sheet.
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