I have some box plants that need raising in their planter

Question

I have some three year old Box trees that are in a raised planter but the soil level has sunken quite dramatically. I want to lift them add soil and re-plant but not sure if this is a good idea and if the moving will effect the trees

Answer 1

You certainly can lift the plants, check the roots and detangle them gently if needed. Add new, good quality potting soil and replace into the container or move up 1 size in containers. Add a bit of new soil to the top of the container after you have adjusted the height.
It does help to water the container well 1 or 2 days prior to doing this so your soil is not too dry or overly wet.

https://www.gardeningknowhow.com/ornamental/shrubs/boxwood/container-grown-boxwoods.htm