Unless they are practically on top of each other, I doubt you'll see much of an issue. Look at the forest. Trees overlap all the time. Unless there's something specific about a Catalpa and a Pecan that don't get along, I don't see a problem.
_________________ Shepherd of the Trees
It is not our part to master all the tides of the world, but to do what is in us for the succor of those years wherein we are set, uprooting the evil in the fields we know so that those who live after may have clean earth to till.
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