What is the ideal soil for Photinia Fraseri (aka Red Robin) grown in a
temperate Mediterranean climate like California?

My gardener planted a row of Photinia hedges and they all appear to be dying
off. The soil is almost clayish, and now I am reading that Photinia like
fast draining soils? I think they were just not well planted, and now I
want to research the topic before making things worse.

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W