re: Need some serious help with landscaping. (Pics included)

Sounds like too much water. That large tree appears to be a Shumard Oak. Those bushes are wax myrtles and sweet viburnum. These things don’t require very much water. They do well in clay soil, but don’t like sitting in water. Even magnolias can get by with very little water. 1-2 days/week for 20 minutes on drip irrigation should be enough. I say reduce watering(especially when raining a lot), and dig out a little bit around the trunks to let them get some oxygen. The mulch looks soaked. Maybe stop watering all together for a week or 2 and let your soil dry out. After the first year you can reduce watering to 1x or even 0 times per week. The grass looks like Bermuda, will still probably need 20 minutes of water 1x/week.