Healthy non-blooming heliotrope

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?
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Rob said:

I think it is begging to be repotted...
--
Pat in Plymouth MI ('someplace.net' is comcast)

Any technology distinguishable from magic is insufficiently advanced.
  Click to see the full signature.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.