Rooted plants you can fertilize right away. With the leaves clipped, I would use half strength for a bit, or use a time-release fertilizer.
If you imagine a stick in a pot, the roots are all going to come from the bottom of the stick, so you want to make sure they have plenty of space to spread their roots. It's better to pot them a bit higher. You may need to stake it until it has good stability.
Good luck!