how far apart do i plant columnar english oaks
They should be 40 to 50 feet away from all other trees. Allow an additional 15 to 20 feet between the live oak and your home, driveway or any other structure. This allows for roots that may extend beyond the adult tree's canopy.
How far apart are yours, also, how do you train them, stakes, cages, fence, etc.? Some say that the farther your plants are apart, the more tomatos you will have on each plant. Likewise, the opposite holds true too. I read a study that was done in another country concerning the relationship between plant densities, and plant yields.