My six-year old heliotrope decided not to bloom this year; despite
adequate water and periodic light application of "bloom booster" all
I have is beautiful foliage. It is in a pot on the south-facing
front steps and gets at least 5 hours of sun daily - although the
summer has been less sunny than usual.

It's been in the same pot most of its life with a little top dressing
added annually; when I put it out in the spring I prune it severely.
In previous years it was gorgeous and fragrant - not this year.

Maryland - zone 6. Advice?