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What kind of soil are they planted in? How well does it drain? Loropetalums require good drainage and do not do well in alkaline soil (pH above 7). They do best in soil with a good organic content (compost). Does the left side get more sun than the right? The left side plants look "burned" maybe too much fertilizer/root stimulator? Usually they are fertilized once in spring and again at the start of summer (mid to late June) with a slow release fertilizer applied at the outside edge of the plant so as to not burn the roots.
Additionally, loropetalums don't always thrive near foundations and driveways as that is usually an alkaline environment.
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