In message
,
Ornata writes
Does anybody grow the white-flowered Epilobium angustifolium? Is it as
invasive as the pink-flowered one?

Common wisdom is that the white-flowered version isn't invasive.

There are two types of the pink-flowered version (diploid and
tetraploid). Back in the 19th century rose-bay willow-herb wasn't
invasive. I wonder if only one of the two types is invasive, and that
type didn't occur in Britain until recently.
--
Stewart Robert Hinsley