Gardenias

Gardenias

I'm considering purchasing some gardenias that are on sale and plan to place them in my narrow side yard. This location gets little direct sun and the soil is rich, but clay intensive. Any recommendations on how to prep the soil and do you think that gardenias would florish in this location? I am zone 9/10 in California. Thanks.
Just a couple pictures.

Just a couple pictures.

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Poinsettas

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Spring, Frogs and Spawn!

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Herb questions (and photos)

ID

ID

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question and unrelated pictures of roses