I just got an email from a customer that I did an install for about 3 months ago. They want me to start doing lawn maintenance for them (so they're not upset or anything), but mentioned that a number of a certain type of plant that I installed isn't doing well and seems to be dying. I'm guessing I should do a soil test and talk to my nursery? How do I go about doing a soil test? I won't know what's actually having problems until I go by on Tuesday. Here is a list of what went in the ground: holly, boxwood, indian hawthorne, aztec grass, podocarpus, gardenias, and ligustrum. Will keep everyone updated as I find out more.