15" is definitely too small for a full-size rose bush -- grandiflora,
florabunda, or tea. I would strongly recommend that only miniature
roses be potted in such small containers.
My miniature 'Salmon Ovation' is actually in a shallow 20" pot that is
only 9" deep. This proved too small for a grouping of four miniatures.
David E. Ross
Climate: California Mediterranean
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