Our visit to Jersey this week inspired this weeks choice as many of the granite walls there were covered with these delightful daisies. Often mixed with campanula (but always on the narrow stretches of road where I couldn’t stop to take a photo!). This is a really hardy plant, self seeds freely and tough as old boots. It likes full sun, and dry, well drained locations- hence perfection in cracks in a wall. Also fills out borders with great mounds of flowers from April to November.