tree root-level

[charles]

 Possibly but I have found, after having similar worries, that all was well in the end because of how organic mtter densifies to a much thinner layer over time, and is taken in by worms. Trees I planted seven years ago, quite deep at the time, are now well clear of the soil with large roots visible. It is good that you have made a hole around the trunks though. Perhaps you will have a spring drought to ease you these concerns….