Answer: Your Allen Chickering Salvia is one of the larger ones and pruning is best done in two stages: a third off the stems in the fall (after flowering is finished), and another half of what's left in winter. This will keep a more manageable shape. I'd prune it back by one-third to one-half now and then pinch the tips of the plants out in about 4 weeks. This tip-pruning may delay flowering for a few weeks but it should encourage branching which will give you a denser, more compact plant.
Q&A Library Searching Tips