Answer: Choisya ternata 'Sundance'is hardy to about 10F and grows best in full sunshine, but I wonder if the planting site has reflected sun and heat? If so, that would explain the burned leaves. Burned leaf tips can also indicate over fertilizing, lack of water, or can be the result of soggy soils due to poor drainage. I think I'd either move the plant to a spot where there is no reflected heat, making sure to plant it in well amended soils to ensure good drainage. Best wishes with your 'Sundance'!
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