Ask Burton: This week, a question involving common North Texas shrubs whose answer lies in understanding our soil and water. Q: I have purple loropetalum and ‘Sunshine’ ligustrum in a sunny, south-facing raised bed. They were planted early last year and did fine all summer. Now, the loropetalum is starting to show yellow leaves with green veins, and the ‘Sunshine’ ligustrum is losing tip leaves and the leaves that are there are stunted looking and tiny.