Question: What about multi-graft trees, or
4-in-1 that have multiple varieties grafted onto one tree?
Unfortunately in Southern California we have not had
good success with multi-grafted trees. The varieties better suited
to our climate blossom earlier and seem to divert the tree's energy at
the expense of the other varieties. The branch of that variety
grows rapidly while the others have little to no growth at all.
Other so-called "high chill" varieties will not
blossom or fruit when used on a multi-graft, but fruit just fine when
grafted onto their own dwarfing rootstock. This is too bad, as a
multi-graft tree is a big space saver if you're wanting to have a lot of
different varieties.
All is not lost however, as apple trees can be planted
close together, and there are methods to cram a lot of apple trees into
a little space. We suggest you see our espalier page and consider
a Belgian Fence, which is quite ornamental and functional besides
producing a lot of different apples.