Your plant dies back, or you cut it back, to overwinter, is that right? Zone 8 is the northernmost area, so a hard winter, like we all had last year, could well affect the plant negatively. Perhaps it just didn't have enough energy to do the flowering thing. It should recover next year, if the winter is not too hard. Continue to make sure it has plenty of water; try adding more phosphorous in the form of bone meal to your fertilizer schedule; and maybe use more mulch this winter. This article has more information: https://www.gardeningknowhow.com/ornamental/trees/brugmansia/growing-brugmansias-in-containers.htm
Answered on October 10, 2014
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