I would have done the same, plant them in a pot (I might use vermiculite or perlite for more aeration) and keep them in a shady spot. I would be careful not to overwater since there's not much root - to compensate for the root loss I would significantly cut back the leaves to reduce the need for roots to take up water. I once had a seedling lose all its roots to a "white grub" of the lawn pest kind. With the above treatment it recovered. I did keep it on a window sill in the house on the north side but not sure that is necessary.
