hilling up of garden soil or topdressing pots to cover exposed roots I do as well. The roots exposed in this way in my garden usually from watering. the problem in minimized or at least less visible with mulch in place which helps prevent the soil from washing away with rain or watering.
I was envisioning a tall rectangular box structure built upwards encasing the stem a couple feet from the soil line when I made my comments.
KarenO.
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