Black Bryony: These beautiful berries, and the whole of the Black Bryony plants, our only native member of the yam family, are highly poisonous. Climbing and twining anti-clockwise through hedgerows, the Black Bryony is not related to its namesake, White Bryony (coming soon!), and has glossy, heart-shaped leaves which die back by the time the berries change from green to yellow and red. At this time of year you therefore commonly see swags of intertwined stems and berries tangled in undergrowth and hedge. Conditions: Cloudy with rain easing. Temperature: Max 18- Min 10C.