American Dahlia Society The primary international resource for dahlia cultivation and classification.
| Dahlia Society of California Organization promoting the culture, history, cultivation, and hybridizing of dahlias.
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Dahlia Variabilis - Texas Plant Disease Handbook Dahlias are susceptible to Verticillium Wilt, Bacterial Wilt, Root Rots, Root Knot Nematodes, Charcoal Rot, and Southern Blight. In every case, diseased plants should not be used for propagation of new plants.
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