Yes you will get quite a good root system with the Oak Trees. If you do curbing around them in the future it will crack so be careful on what border if any you use.
If you are going to take the trees out take them out NOW, if they get much larger TV will not allow you to take them out, 4 inches is when you have to leave them in and it is also much easier for them to be removed now the longer you wait the bigger the root system gets.
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