I had a job at an Econolodge where I installed several shrubs and a sprinkler. The soil in the island was so hard that in some places, I had to use a mattock to dig in it. Now, I'm being told, a couple of the nandinas are dying and one or two of the Indian Hawthorns is turning white. I was wondering if that could be because they're still retaining too much moisture. I wouldn't be surprised to find that they're being overwatered. Thanks in advance folks.