Ceratostigma willmottianum 39forest blue39 is a popular deciduous shrub with a well45deserved rhs agm from august to october its wiry red45tinted stems play host to a profusion of cobalt45blue flowers the green summer foliage turns to vivid shades of burnt orange and red as autumn progresses bringing a welcome splash of colour to fading borders a low spreading shrub 39forest blue39 deserves a prominent position towards the front of a sunny border or planted against a