This lilac lovely is Hesperis matronalis, commonly known as Sweet Rocket and occasionally the evocative Mother of the Evening, referring to its twilight scent. Conversely in the USA is it sometimes known as Noxious Pest, having naturalised itself in areas to the detriment of local wildlife; this is not quite as romantic. The balls of four petalled flowers come in a range of white, pinks, lavenders and purples. The young leaves can be eaten and are best picked young when the plant is in flower, although slightly bitter to the taste they are high in Vitamin C. A mediterranean native it is loved by the bees and butterflies.
Hero came across a pair of deer in the garden this morning and savoured the moment until they caught her scent and retreated back into the woods. I expect they will be back tonight, in return savouring more our of plants!