I have a huge flat paved area with four 6 foot square spots for single trees. The base is crappy impermeable crush and run and clay. The first trees to die were flowering cherry (Kwanzaan). They died from too much heat and a summer long drought. Next we dug up some of the clay and crush and added topsoil and compost. Planted crab apples. They survived one year and started out this year before we had a replay of Noahs ark days with a solid month of rain and standing water. Presently have tables placed on the grated tree space and it looks better. Any suggestions besides plastics or a cool 6 ft square paver pattern?