I put the orchids out - mostly Cattleya alliance - in the yard every summer. I put a tarp on and off to minimize sun damage - on during dry days off when it rains. I want to invest in shade cloth so I don't have to be spending so much time tarping and untarping and finding I'm too late for sunburn and squashed plants from weighted down rain filled tarps. SOOOOO going to invest in shade cloth. Now, what shade %??? I am in Pennsylvania, the area they are at gets full sun for probably eight hours easy now. Any recommendations for shade percentage.