Managed to root these buddleia cuttings and I was just wanting to know if when I pot these on can I bury the stems up to the bottom leaves or do I keep them this height in their new pots
I'd leave them for a while yet. The new roots will be tiny ,and very delicate. When the roots are showing through the bottom, tap the whole thing out gently and have a look .
I'd probably leave them be and give them some TLC until next Winter before splitting them.