Answer: I'm a little confused here - did all the gardenias at the garden center die, or did all the gardenias in your yard die? In either case, it's sad to hear. Gardenias require moist soil and shade from hot afternoon sun. I can only surmise that the plants didn't get enough water or that they sat out in a hot spot and got baked. You might check with your garden center to see what their policy is - perhaps they will exchange your gardenia for a healthy new one. Hope so!
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