Generations of gardeners have added stones to their pots before topping up with compost, but does it really help?
The problem
Most old houseplant guides suggest adding a layer of gravel or stones to the bottom of the pot before adding compost. It is presented as basic good practice; the thing you do to stop soil from retaining water, which can cause root rot.
The hack
This layer of gravel is said to improve drainage by providing a place for excess water to collect below the root zone, keeping roots above the waterlogged area and allowing air to reach them from beneath.