Summer Plum Pruning
I have a 6 year old plum tree in Seattle. It's perhaps 7ft tall. It's one of those 'combo' deals: there are 4 varieties grafted on.
Last year, it sustained a broken main branch so I did no pruning (for some, completely unscientific reason I thought it might be good to let it 'recover'.)
This year it went NUTS with vertical shoots and almost no fruit.
So... suggestions for pruning it? It looks a mess.
My initial plan was to chop off ALL the vertical shoots down to the horizontal 'main lines', but I thought I'd ask here first.