Thanks, Lin and Joanna. We already have all of the plants you list, Lin - possibly not enough of them, though!
We have I think three different kinds of butterfly bush here - one that I planted and 2 that self-seeded.
The one I planted seems to be really vigorous - perhaps I should think about removing it... Monarchs (the butterfly kind!) do exist in England, but they are very rare - I'll get some milkweed to see if I can attract them. I already grow stinging nettles for the Red Admirals, which we see regularly, but they are common throughout the country so it may have nothing to do with my nettles.
