I have géraniums that I overwinter and that I would like to repot. They are planted in a very large glazed ceramic pot which is
very heavy. I would like to remove the dirt and add something light at the bottom of the pot to make it lighter. When is a good time to repot and what kind of soil should I use. Also, is this a good idea.
Certified GKH Gardening Expert
They will handle most standard potting mixes, so it is up to you. When they first start actively growing will be a good time to start this process. For heavy pots, it is recommended to use the "pot within a pot method." Here is more:
This article will give you some useful information: https://www.gardeningknowhow.com/ornamental/flowers/geranium/geranium-care.htm