Hi Frank. For spring grafting (as opposed to summer budding) with apples it's important that the tree be well out of dormancy and nice and juicy. I was taught to graft when the leaves are as big as squirrels' ears. There's a decent window of opportunity- a few weeks- but it's nice to get it done fairly early so that the new scion has as long as possible to grow the first season.

Good luck,

Mark

Hey Frank,

I'll be teaching some grafting classes here in WI if you're interested. There's a small fee with those so if thats not your thing no prob. Following each class is a free scion exchange, open to the public. Would be a good place to pick up some other varieties for your grafting needs. Events will be in Milwaukee, Madison & Two Rivers, WI. If you want more info just send me an email through gardenweb.

Thanks,
Little John