Answer: Lavender and lantana are quite drought resistant so if you water too much or if the soil drainage isn't very good, the plants will die. This is especially true if they get too much water during the winter months. Since you have sandy soil you probably have excellent drainage but you may be keeping the roots to wet with frequent watering. Try watering deeply once or twice a week during the hottest months of the summer. You can water your roses once or twice a week during the hottest months, too, and then water less frequently in the fall and winter months when they are not growing as actively.
Best wishes with your garden!
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