The message
from "Dave Painter" contains these words:

You can get a selection of different apples
grafted to your basic rootstock
AFAIK the limit is three different, so you can have an early cropper a late
cropper and possibly
a cooker too.

Whose rules say three?

--
Rusty Hinge
horrid·squeak&zetnet·co·uk
http://www.users.zetnet.co.uk/hi-fi/tqt.htm