Pwinget, thanks for the info.
I knew those walnut trees are of no good
But I can't cut them off as they are my dad's... he's hoping to eat a lot of walnuts soon :)
Funny thing, I have most of my big peonies (herbaceous and tree) close to the walnuts. The herbaceous always bloom nicely.
Also the trees show a lot of plump buds now. Let's see what happens soon