|P. zonale leaves showing typical dark zone|
Almost certainly P. zonale, together with P. inquinans, is the parent of the zonal pelargoniums we know today.
I fear I have a few losses in the greenhouses. It has been bitterly cold over Christmas with a temperature of -10C when we got up yesterday morning. Three plants have been brought inside to my 'hospital' ledge in the conservatory for extra cossetting. We are promised some very mild days later in the week.