I am planning my coop and chicken yard. Wanted to know if it is ok to include some grape and muscadine vines in the area the chickens can get to. Will they destroy the vines like they tend to do with grass etc.? Will the grapes and muscadines (fruit) hurt the chickens if they get too much of it? I don't care if the chickens eat some/most of the fruit - just don't want to harm them or have them kill off the vines.