We are new to chickens. Nearly my entire yard is covered in myrtle( periwinkle, vinca minor...whatever you wish to call it). Is this going to be okay for my confined chickens? They will be in a chicken tractor which I will be moving each day. City ordinance says they MUST be confined in the back, which is all myrtle. Should I start digging it all out? We of course have a lovely dandelion and violet covered front lawn.