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How can budding off be stopped on a mature Gardenia? The plant is healthy in all other ways, but the buds always fall off before opening. What is causing this?

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I've posted an answer on the most common reason I could thing of, I'll edit if these question bring anything to light. Have you had a problem with it before or has it just reached maturity? Is it being moved around at all by a fan/people? Is it in a particularly dry place? –  WienerDog Mar 16 '12 at 18:31
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There are a few things that can cause Gardenias to drop their buds prematurely. The most common cause being a lack of humidity. What is the relative humidity where it is being kept? Gardenias are native to a very humid, tropical environment and like a lot of heat and light, but not direct sunlight.

A few other reasons I can think of:

  • What is the soil pH? Gardenias like acidic soil.
  • Is the pot being moved around a lot? A lot of motion can easily cause dropping buds.
  • Is there a lack of light/heat?

For humidity you can try using a humidifier to increase the humidity or a tray of pebbles in water under the pot I've heard can work. Here are more information and references if needed.

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