Answer: I just examined the MSDS (material safety data sheet) for Vigoro Weed and Feed. It lists the herbicide 2,4-D, which is a broadleaf weed killer. Unfortunately, the chemical cannot differentiate between a broadleaf weed and a broadleaf tree. If you applied the product at the proper rate, it should not have a great effect on your birch tree, but if you overapplied or if the roots of the tree are close to the soil surface, an application of 2,4-D could have an adverse effect, at least on the leaves. I would hold off on using a broadleaf weed killer until your tree recovers, and even after I would be careful with these kinds of products near the root zone of the tree.
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