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I asked this a while ago, but now we are entering grafting season, so 
I'll ask again.

I ordered a couple of new apple trees this year.  I couldn't get 
exactly what I wanted, but I got the rootstocks I wanted, and two of 
the tops are things I was looking for.  Between those two, and some 
prior grafting, I will own both the rootstocks and scions I want.  I 
plan to graft to put them together.

When would you recommend I do this?  Right away?  Later in the season?  
After the roots have established themselves for a year or so?  And 
would you recommend spring grafting of twigs or summer grafting of 
buds?  (I figure with everything on the property, I can bud graft if I 
want to.  I don't need to depend on getting dormant scions from someone 
else.)

Thanks for any advice.
Ginda
eastern massachusetts, zone 6

p.s.  I'm pretty good with knives.  My prior grafting experience has 
all been dormant twigs, not buds, but my success rate has been pretty 
high.  I figure I can graft buds, too.