In message , MaC
writes
it's prolific with it's seeds and if you leave them to develop
healthy
roots they're a real pain to remove. They seem to have a
preference for
tubs full of soil but otherwise empty, waiting for
bedding plants;
probably the *light* needed for germination mentioned
in another post.

We had some in the greenhouse one year when we were too busy to do
anything about it: and with them the most wondrous, magical elephant
hawkmoth caterpillars, and then the moths...


--
Klara, Gatwick basin