I'm going to plant some vegetables in long shallow planters (6-8" deep, 3ftX10ft) on my roof this year, mostly salad greens. This should be o.k. in the spring and fall, but summer in Toronto on a flat roof with noon to evening sun can be brutally hot. Does anyone have experience growing hot weather plants in shallow soil/growing media, any suggestions? It would be a good spot for tomatoes or melons (25-35 degrees celsius) but i don't think the soil depth would be great enough. Again, anyone with experience with this type of planter care to share their knowledge? The planters serve a dual purpose of growing food and insulating the house. It's for this reason that they cover a lot of area and need to be shallow - half roof garden, half green roof. I think I've got the weight, watering and drainage issues resolved. I've never used shade cloth, could that keep greens going longer into the summer? Also I thought of fewer deeper planters that could grow vines like squash or melons that would trail and shade the roof. Will they get burned laying on a black tar roof at that gets extremely hot.?