Dave Wilson Nursery
Backyard Orchard Production

http://www.davewilson.com/homegrown/BOC_explained.html

Other hole had 'Redhaven' and some cold-hardy low-bearing nectarine whose name I forget. I took out the nectarine so the other tree is by itself.

I probably would have been better off with 'Hale' 'Redhaven' and 'Polly' all in separate holes. But how would I have known in advance that those are the ones that would work?

My advice is to go ahead, but pay attention to relative vigor. that means more than just planting same kind of fruit on same rootstock, but paying attention to the actual type of tree it is.

Also, don't be afraid to cut down a clinker after a few years (if you don't need it for pollination).

Advantages:

• I can grow 700 different varieties of fruit in my suburban yard.
  
• You can have an extended harvest range of about anything.
  
• It is easier to keep the trees lower height -- its like the major scaffold branch point is 2' below the ground instead of 2' above so all trees have fruiting zones moved 4' lower this way. You need to get branching going low on the trees to take advantage of this.
  
• As kokopelli mentions, if one variety is bust chop it down and let the others fill in. Many varieties don't work out so this is a very handy thing to be able to do. If you are growing fewer varieties it will take 3-4 years to get that new tree going.
  
• Compared to grafting many varietes on one stock it has the advantage that if one stock goes bad you still have the other varieties there, again saving that 3-4 years to get the replacement going.

• Pruning the trees is in fact quite difficult. I think if you are in California you can be sloppy about it, but in the more humid parts of the US there will be too much disease if one is not very careful on pruning. Along with diseases, problems you can run into problems with lack of or limited fruiting due to too much vegetative growth. The key to solving this problem is along with summer pruning be quite strict about limiting the number of scaffold branches, and in general look at every branching point where multiple branches come out as a possible thinning point where one or more branches can be removed.
  
• It is very possible for one variety to dominate others if you are not careful about the pruning. Again with experience this can be solved but its not beginner stuff by any means.
  
• The overall yield may not be as great as with a regular planting - the pruning decisions that need to be made to keep one variety from dominating or from being too thick in one spot sometimes prevent other choices from being made which would yield more fruitfulness. I have found it varies how well I do based on variety, on peaches persimmons and Japanese plums I get great yields but on apples and pears and cherries it is harder. Also experience in pruning can help a lot here, I made a lot of mistakes in the beginning.
  

For me I have overall been very happy with them. The biggest mistakes I made was not knowing how to prune right for several years, and doing some plantings that were too close, closer than the recommendations. Pears and European plums in particular were the biggest problems and I would say they need at least 4' per tree. I have some pretty odd-looking pears and Euro plums because they did have too many scaffolds but I later removed many, including all but one at some big branch points, so now the trunks zig and zag.

Scott

Scott

My yields and fruit quality have been great so far.

Biggest concern is getting renewal wood down low. After a few years the good fruitful wood gets higher and higher in the tree. Eventually renewal pruning becomes necessary. So I've been taking out large limbs down low. This doesn't always result in new wood as low as I'd like it. On the new thicker trees I plan to force new wood down low sooner rather than later. We'll see how that goes.