We have 8 chickens about 14 weeks old and they have a run we keep them in mostly but like to let them out in the evenings after work to run around the back yard. I recently noticed they are destroying everything green! They killed my Iris, eating my tulips, vinca, roses, and weeping cherry tree. We don't want to keep them locked up ALL the time in the run but can't have them destroying everything either. We also don't want to wrap all our plants in hardware cloth it defeats the purpose. We are planting garden vegetables now and they are covered but I don't want them killed either. We give the chickens fresh spinach and lettuce and other treats from the kitchen but it seems to only help short term. What can we do?? Help!