Hellebores, mahonia, viburnum, early narcissus… all stars on the rollcall of winter flowers that stand up to the weather and draw us into the late winter garden. Yet, as I write this at the start of December, I’ve seen them all in full bloom on a garden visit today – alongside the tail-end of autumn’s periwinkle, hydrangea and autumn crocus. It seems several seasons in one day in our gardens isn’t so unusual.