Mycorrhizal fungi is a beneficial fungus that affiliates with over 95% of all the plants on the plant. It assists with nutrient and water uptake, transplant shock,  and soil aggregation. Soluble MAXX has amazing species diversity which covers a broad range of plants. There are other ingredients that are beneficial to soil health. This product will help the trees, shrubs, grass, vegetables, herbs ........  It does not affliate with the Brassica group of plants. It will not hurt them, it just won't affiliate with them.