Anyone know what this plant is?

Wildlife

Wildlife
We're about more than just birds (though obviously we like them a lot).
Identify this

Anyone know what this plant is?

This question is not answered
IMG_20180612_175657.jpg
This appeared in a friend's garden last year but we've no idea what it is. Photos show this year's growth and the bamboo-like cut stems. Flowers appear july/August very small, white inside and purple outside, in clusters that hang down like upside-down lupins 3 - 4 inches long. Any ideas?
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  • Just an idea, but I suggest you look at Japanese Knotweed, just in case. It's a very fast growing invasive plant that dies back every winter, leaving dead, cane-like stems, only to put up even more 2-3m tall stems the following year.

  • It is a possibility, but not sure if it is.

  • I did consider that but this plant is missing the "distinctive" purple flecks on the stems and the flowers are the wrong colour.