(Me being an obsessive plant parent) About to repot some new plants, and a couple have the tops of their roots exposed above the soil and are dry. Will this pose future problems for the plant/will it be fine once I repot it with topsoil and water? Additionally, how deep into the soil do you usually plant a stem? Concerned about avoiding stem rot while also keeping the plant stable enough (ty in advance - trying to correctly re-learn some houseplant basics haha).