Mark Wolfe from bobvila said that Too much of a good thing can be harmful—or deadly. In mild cases of over-fertilization, plants exhibit excessive green growth. It may look good at first, but all this soft growth is susceptible to attack by sap-feeding insects like aphids, spider mites, and others.
In more severe situations, plants may exhibit wilted, yellow leaves with brown margins. This is called fertilizer burn, and it could be deadly.
Do not fertilize plants that are suffering from drought or other stress factors. Always follow the directions and precautions on the product label.