Tree Dahlias, Dahlia imperialis, are without doubt an impressive addition to any garden, however they can be difficult to overwinter due to their subtropical origins. That said, with a little thought before planting and minimal winter protection you can overwinter tree dahlias in the ground, avoiding the rigmarole of lifting them out the ground and overwintering them in a frost free position. in this video, English horticulturist Simon discusses his five mistakes to avoid when overwintering or winterizing the Tree Dahlia: Winterize Dahlia imperialis.
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