Erigeron karvinskianus

Mexican fleabane, Erigeron karvinskianus, is a charming slender plant native to Mexico, but has established itself in many Mediterranean areas and dry gardens in Britain. It looks lovely creeping down the sides of stone or brick steps or tucked in wall crevices, where it both seeds itself and also spreads slowly with its rhizomatous roots. The Royal Horticultural Society has given it its prestigious Award of Garden Merit (AGM).

Grow Erigeron karvinskianus in well-drained soil in full sun. It's easily raised from seed, which may be scattered in the cracks between paving stones or mixed with a little clay and pressed into hollowed mortar joints in walls.