Brimstone Butterfly– one of the few UK butterflies which overwinter as adults, I’ve been watching this beautiful female which will have emerged from eggs laid by the overwintering generation. They will be around feeding all autumn, building up for their hibernation. Opinion is divided as to whether the colour of the much more yellow male of this species (see other photo) gave rise to the generic name of ‘butter’-fly, but male and female are both beautiful and distinctly shaped. The caterpillars rely on buckthorn and alder buckthorn so please grow either in your patch if you can (Can be bought from Ashridge Nurseries mail order) Conditions– sunny intervals. Temperature: Max 20- Min 11C.