I grow lots of annuals in containers. generally very successful. I have noticed that certain plants fairly quickly dry up in late summer, even though moisture is adequate. Happens with some cosmos ( "Unique" and "Antiquity") and multiflora petunia . I suppose this is just natural, but i do wonder if one can delay or prevent it. BTW: i believe i have read that petunias can be cut back
Thanks for any information.
Jim W - Lancaster MA