I planted Patty's Plum last autumn in my new garden, and it is now forming flowerheads. I had 11 flowerheads last week, but then suddenly some of them started drooping and from the weight snapped in the wind.
I have now tied the remaining and new ones to bamboo canes, but am hugely worried that I won't have any left before the buds open. Some of the buds have black residue on the spot where the stem seems softer and bendy.
Any clues on why this is happening?