Cannibalistic Vegetarianism...or Something Like That

Yesterday I picked up some beautiful, fresh green beans that I decided to save for Easter dinner. I thought I should blanch them before I freeze them--I heard that's how you keep them from turning an ugly black color between now and then. Anyway, I saved the water from last night when I blanched them to water my tomato plants today. It occurred to me later...does that make my tomato plants sort of cannibalistic?