How to Prune perennial phlox 'Lilac Time'?
Deadhead to prolong flowering then cut down to the base in late autumn

perennial phlox 'Lilac Time' · Phlox paniculata 'Lilac Time'
Grow in fertile, moist soil in full sun or partial shade. May need support
Deadhead to prolong flowering then cut down to the base in late autumn