I'm looking for a good recipe for impatiens. I've tried a perlite/potting soil/sand mix but it wasn't successful at all (didn't hold much moisture). Would a perlite/pear moss (or coco peat) mix work well? What about Jiffy pellets?
Jiffy pellets work well. So does Jiffy mix. I have used peatmoss sphagnum (50%) mixed with 25% fine grade perlite and 25% vermiculite #2.