how invasive is this Herb Robert? im practically at the start of a very, very long road of trying to look after the garden a bit better. we have poorly drained, heavy clay, very acidic soil, and suffer from bits of moss, the usual dandelions, horse tail in summer ... a lot of this one weed that has small white flowers, but incredibly easy to pull out the ground. not sure what that one is but we get that a lot. also had some thistle, even some weird mushroom thing (orange-ish) in the shaded bit that gets no sun.
anyway, i digress ... point is, after suffering with these weeds for quite a while, and suffered many a backache trying to suppress them all - id rather eradicate the nastiest ones, but dont mind the less harmless ones. there's something kind of quite charming about seeing something grow by itself, but im more than happy to pull it out if its going to cause me problems!