Hello, there is no easy answer to that question in that dahlias like people vary in height and if they are a tall grower then they are a tall grower! Possibly growing from tubers rather than plants would mean more stems and would disperse the 'energy' of the plants over a greater number of stems. Or maybe growing in pots rather than the open ground would have a similar shortening effect.
Hope this proves of some help.
Paul (Author)
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