By looking at the foliage it doesn't seem to be damaged. It could be combination of the problems. Repot last year, mud like soil in the centre of the rootball (hard to water if dried). Trees in this acadama residues mud struggle. Overwintering in garage sounds safe but question is how you manged to water it during winter.
Now, I can't imagine summer climate where temperature is usually around +30C how hornbeam can do well with one watering a day.
Another point is, year after repotting hornbeams could stagnate sometimes.
With proper watering hornbeams can sustain a lot of sun without shading and not damaged foliage.
Now, I can't imagine summer climate where temperature is usually around +30C how hornbeam can do well with one watering a day.
Another point is, year after repotting hornbeams could stagnate sometimes.
With proper watering hornbeams can sustain a lot of sun without shading and not damaged foliage.