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This came out of a packet of seeds of mixed perennials - or it might be from a seed in my worm compost. It was planted last year and was small over the winter (~ 2"). Then it started to grow in late spring - tall enough to be transplanted into the garden - next to a Rudbeckia. By then it had doubled to 4". Slow growth until about four weeks ago when it became a monster - about a metre + tall.
Originally with the colour and sheen of the leaves, I thought maybe Dahlia, but now I haven't a clue.
Can you help?
I could be way off, but reminds me of Nicandra physalodes... stems dark purple almost black?
Should have had blooms by now, then.
Could be something else...
Yes, it seems to be Nicandra physalodes - it has started to develop those very distinctive 'ridged' flower buds.
Thank you fixpix. I'm not sure I would call the stems black, though.
Also, now I think of it, I swapped some seed and got a small pack of Nicandra physalodes - I must have mis-labelled them.