Viola can be annuals, biennials or deciduous or evergreen perennials, with simple or pinnately lobed leaves and 5-petalled flowers of characteristic shape
Violas are compact reliably perennial, clump-forming plants with a complex root system and rounded, more or less fragrant flowers, often with darker rays, over a long period in late spring and summer
'Moonlight' is a spreading evergreen perennial to 20cm tall, with ovate leaves and narrow, long-stemmed, pale creamy-yellow flowers 3cm wide in late spring and summer