Robert wrote:

Plums (stone fruit)..late spring or summer to minimise getting silver leaf
or canker


I'll second that.
Everything I've read says late spring when the leaves are just coming out.
That's what we've done with our Victoria plum for the last 6 years and
so far, so good.

Jeff

PS Aren't Victoria plum trees supposed to be biennial croppers?
We've had bumper crops from ours every year since we got it.