Even January has its wildflowers, notably the Stinking Hellebore (Helleborus foetidus) which can be found in woodland glades, hedge banks and scrub. Self-seeds readily in some locations with a marked preference for calcareous soils.

 H. foetidus is a native species that is also cultivated in a good many gardens. As such it is both a wildflower and a naturalised garden escape; the distinction is moot I imagine.