Living in the Southwest is a challenge. The soil is a HARDPAN CLAY here. It can be very difficult to grow things in. Due to the lack of any natural mulch and the fact we live in a flood plain during summer monsoon's; the soil is real alkaline. I heard that COFFEE GROUNDS (a good soil conditioner) add acid to the soil . I add them to every hole I dig. Recently, I put more than I meant to around a PHOTINIA FRASERI and now it's leaves look like they are burned. What do I add to try to counteract this mistake? I've been trying to water it more often than the others but may have to admit defeat and replant. Any suggestions?