The large and abundant fruit is considered messy and unwanted and makes landscaping with black walnut trees undesirable to some. This mess means that only some landscapers, know how to effectively deal with it. More importantly, Black Walnut trees produce a chemical called juglone that can kill or damage some plants.

Are walnut trees bad?

Black walnut trees have a well-deserved reputation for making life difficult for gardeners because they release a toxic compound called juglone, which can adversely affect many kinds of plants. ... The roots are also toxic and juglone can persist in dead wood for years even after the tree is removed.

Are black walnut trees desirable?

Black walnut (Juglans nigra) is considered one of the most valuable trees native to North America. Its wood is valuable for furniture and cabinet making and its edible nuts are harvested for commercial sale.