butterfly colourful flower flowering garden insect nature spring tree wallpaper daisies daisy England Great Britain petal white yellow bloom convolvulus cultivar plate silverbush Anthemis blossom compositae fritillary Great Spangled Fritillary orange speyeria cybele annual blooms petals purple summer viola viola tricolor abundant layer many profusion shrub bee flying garden insect hover fly in flight colors dice-box grass green red seeds sun border colour display natural path perennials pink show