Heliotrope is not grown as an indoor plant. Though it is a tropical short lived perennial, it is not adaptive to indoor culture as a rule.

When you've grown in containers for a long time, you sort of get a sense for things like you're asking. Sometimes you can look at a plant and tell whether it will be easy or difficult to propagate, or even how much fertilizer it will like. When I think about heliotrope, I don't get the feeling it will do well indoors unless you can keep humidity levels north of 50% and temps warm and light bright and the mites at bay. Don't let my 'feeling' stop you from trying, though. If you make it work, please tell us about it. I think that if I wanted to over-winter this perennial, I'd stick it in a dark basement corner and let it stay very but not completely dry, and move it back outdoors as soon as temps allow.

Al