How far down do I trim my annuals?

Question

In preparation for some extra fall blooms I am trimming down my annuals that have gotten spindly, specifically salvia & petunias. I live in North Carolina by the way, in case that makes a difference, and this is the time of year this is to be done, unless you are pulling out all the annuals in September in exchange for mums or pansies.

Answer 1

Cut off any old bloom stems, and any of the leaves that are looking unhealthy.

Answer 2

I recommend trimming both back by about one third.  They should recover and reward you with bursts of full, robust bloom within 3 to 4 weeks.