Posted: 22/07/2015 at 16:51
It does get very leggy, but pruning should help keep it manageable. You could try taking cuttings to produce a new bush, which could replace the old one in a couple of years.
This year I cut back one section of my sage bush straight after flowering, and the rest some time later. The first section has rewarded me (and the bees) with another crop of flowers, so I will try to remember to trim the whole bush as early as possible next year.