Invasive?

When you buy these here, they are called "wood hyacinths" or "English wood hyacinths." I take them to be those bluebells that are everywhere in the UK at this time of year. In any case, some people say they are "invasive" - but to me, in this case, that is not a huge problem. Certainly not as invasive as English ivy!!! Be that as it may, I love them, and I have blue, pink and a few white ones - and they are starting to appear in places where I didn't actually plant them, and I'm in favor of that.