Fruit trees and Rootstock

Are there benefits to planting trees with the same rootstock togheter?

In my opinion it is not good - it's some form of a rootstock monoculture. If may turn out that a chosen rootstock will have a problem in a given setting.
I always pick standard or close to standard rootstock that will make large trees for three reasons: lifespan, better tasting fruit, potential drought resistance.

Cristobal Cristo wrote: I always pick standard or close to standard rootstock that will make large trees for three reasons: lifespan, better tasting fruit, potential drought resistance.

I love standards for these reasons also. They also seem to be much more generally healthy and resist pests better for me also.

I have had good luck with seedling rootstock and bury the graft underground to encourage the fruiting variety to send out its own roots.

The only advantage I can think of at the moment is that known rootstocks have been chosen to give predictable final sizes for the fruiting trees. So in a monoculture orchard you can plant the trees Xft apart to give good spacing for the grown tree. However, the scion also will affect the size that the tree grows to, so unless you plant only the same variety of fruit (all golden delicious apple or all morello cherry for example) then even this advantage is lost a bit. There may be a case for using a rootstock with a known disease resistance, as I believe they do for grape vines in some areas, but I don't think these have been selected for top fruit trees as yet.

Well, the pros are that you get a larger harvest from a smaller space, and the fact that these rootstocks are compatible means you don’t have to worry about conflicts between the different species of tree. The cons would be that if one tree gets sick, the others may catch it too. Also, pruning and training the trees can take a bit more effort if they’re all growing together. Bottom line - it’s a great solution if you’re short on space, but remember to keep an eye on those trees!