Answer: New growth means the roots are healthy so I would simply cut off the parts you know are dead to make way for the new growth. The foliage is heat sensitive, especially after having grown indoors for the winter months. Perhaps a heat wave or even an extended blast of hot air has dessicated the leaves. Morning sun should be fine for your plant. Try to keep it out of hot summer winds and you might want to hose the foliage off each time you water your gardenia. This should help offset the hot, dry summer air.
Best wishes with your gardenia!
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