Hello Gardeners, I’m Amanda McNulty with Clemson Extension and Making It Grow . Both Prunus serotina, black cherry, and Prunus caroliniana , cherry laurel, contain prussic acid, cyanide, and the wilted leaves especially are harmful to horses and cattle. If you crush the leaves of black cherry, you can really smell that acrid compound. On the other hand, if you rub cherry laurel glossy evergreen leaves together between your hands, they smell just like maraschino cherries. Cherry laurels are easy