We have 2 European Hornbeam on either side of front stoop. Nice taller smaller cylinder shape is what we wanted. We were told the shrub/tree shape would not change shape much or grow very high. Looks nice and green. However, after first year it is growing much higher and starting to spread out some. Wondering when is best time to trim down the height and the circumference; and also how to trim it down. Seems we can trim off lower branches to expose a bare trunk below stoop floor level.