Lobelia tupa
Hello - Would any of you have experience with Lobelia tupa? I would like to know whether I should cut them right back to the ground before winter...
For the record, my L. tupa seem to have decided to be rampant rather than upright, and though I quite like it, I worry the stems will rot altogether during the rainy months. I only got one flower out of 8 plants planted in late Spring, fingers crossed it'll be better next year.
They're still looking good for now though
Thank you in advance for your feedback.

They're still looking good for now though

Thank you in advance for your feedback.

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They should flower next year, they’re perennials. They grow very tall so you could stake them to keep upright.
@Silver surfer Thank you for the beautiful photos. I only had one flower blooming this year but it was impressive like this one. Mine's looking a little wilted now but hopefully all will flower next year.