Deborah Dietz, the Dahlia Society of California's corresponding secretary, says hybridizing dahlias is a challenge, "a genetic lottery."
Photo: Lance Iversen / The Chronicle
Deborah Dietz, the Dahlia Society of - Media (1 of 8) Hello, dahlia! S.F.'s official flower in
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Deborah Dietz, the Dahlia Society of California's corresponding secretary, says hybridizing dahlias is a challenge, "a genetic lottery."
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