I recently did a small instal and have plants dieing. I put jap maples nandeenas and soft touch hollis in one bed the hollies are dieing but the other plants are doing great. They have started browning from the outside of the plant on in to the middlr. I checked the soil their isn't too much moisteir the plants are watered 3x a week by th owner and they claim thye haven't used any chemicals.I've sent in a soil sample. Just wondering if anyone had any ideas I haven't thought of. Any advice would be greatly appriceated.