I have a pergola measuring about 10' square by 8' high which is at the moment covered by grape vines. It is built on a exposed rock but has some soil of varying depths surrounding it. It gets full sun except for on the northern side and the climate is usually wet in the winter and dry in the summer and is in zone 7. I do not harvest the grapes for several reasons but the racoons are a real pest as they love them. The bear problem we solved with an electric fence! The time has come to replace the vines with something which does not fruit but which will give good cover from the summer sun. At present the vines are planted only on two opposite sides of the square. Any suggestions please. Thanks.