Posted: 31/07/2012 at 19:15
I like Buddleia too but it can be a bit invasive if you don't keep an eye on it. They can self-seed all over the place and they put up root runners too.
I would like to get some blue cranesbill (geranium pratense) for my garden. We have some in pink and the bees seem to like it, but I am also a big fan of blue flowers. The cranesbills are easy to look after and are good ground cover. I like this one: http://apps.rhs.org.uk/plantselector/plant?plantid=6349
I've recently planted some blue salvia and some Russian sage (Perovskia) http://apps.rhs.org.uk/plantselector/plant?plantid=1411.
Maybe if we ask nicely we can persuade the RHS website to include a search option for "bee & butterfly-friendly"?