Iris

I prefer to prune ALL Prunus species just after the first set of leaves
harden off in the spring, most Acer species too. Here in N. CA, we have
a lot of spring fungal diseases that affect these species and late
winter pruning leaves open wounds that can be infected. By late April
the window for these diseases has closed, and the wounds wall off very
quickly.

Brent
EvergreenGardenworks.com
see our blog at http://BonsaiNurseryman.typepad.com

Michael Persiano wrote:
Iris:

I've not worked with it. Brent should be able to advise you.

Cordially,

Michael Persiano

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