Plants that go wild

Forget-me-nots; so aptly named!
I love their frothiness, but they do get everywhere.

Grape hyacinths (Muscari)
So many little bulblets! Impossible to remove them all, and if you have one this year you will have a dense carpet next.

I agree about the lemon balm - great for bees but it is domineering and as tough as old boots. We have it among the paving stones and really have to work hard to keep the pathway clear.

Thanks for the heads up about a passion flower MayBee. That was on my list for this year, but I'll do some more research first!!

We bought some lovey daisies once. They spread everywhere. Four years on and they are still coming up in the lawn.. Our agapanthus gets ravaged by snails so looks most unattractive. But however many times we clear away seedlings it returns,.

Passion flower. Had one in the garden that did nothing for years: assumed it was dead. Then, one summer, it literally took over the garden. Even covered the washing line. Was a nightmare to get rid of. Pity really because the flowers are lovely.