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Gardenia bushes outside

I have 3 gardenia bushes planted outside. Some of their leaves are blackish and some are even dead. Is this caused by insects? What should I do?

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1 Comment To "Gardenia bushes outside"

#1 Comment By Downtoearthdigs On 03/16/2017 @ 9:05 pm

Your Gardenia has Sooty mold, which is generally caused by aphids or scale.
Neem Oil is a good organic treatment and is safe for people, pets and Bees!

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