Dear All, Having read all the contributions on Dahlia species I wonder whether none of you grows any other species than the tree Dahlias and perhaps one or two other smaller ones. The List of species Alberto Castillo sent is very impressive but are any of thes unknown (to me at least) plants in cultivation? Are they suitable and worth cultivating? Are there any botanical collections of Dahlia species somewhere? I find Lauw's point very interesting concering the flowering time of Dahlia imperialis. To me it definetely looks like an extreme short day bloomer. At least I think the formation of flower buds is induced by short days, once the plant has been triggered into flowering it may well flower into the longer days of spring. That is what I have always heard of all the people who grow this plant in Europe. My own plants never flowered because they alwayswere cut down by frost around mid October and they might have been too small anyway. But what Alberto writes sounds different indeed. Perhaps this is the strain that is day length neutral. In all short day bloomers there is always the odd day lengh neutral plant and this being more floriferous in gardens it may well have been selected and cultivated. Are there any Photos to be seen online to see and perhaps compare these plants? Bye for now, Uli