Mackintosh left Glasgow in the early summer of 1914, and he and his artist-wife Margaret Macdonald went to stay in Walberswick, Suffolk. There Mackintosh produced a series of flower drawings, and a number of watercolour studies of the surrounding landscape. This watercolour inscribed ‘Petunia Walberswick 1914 CRM MMM’ shows two flowers of Petunia hybrida from South America, the commonly grown half-hardy annual, and an unidentified plant lower centre.