In the past, it seemed to me that I had better success growing the white Heliotropium arborescens outside - planted directly in the garden over a stone wall - than the purple kind, and I have no idea why. It gets very hot and humid in our summers - is there a reason why the white variety might be more tolerant of that? I started with store-bought plants.
But now I'm thinking about starting from seeds this year.
https://www.selectseeds.com/Se... sells a few varieties of this heliotrope both as plant and seed, and I'm contemplating growing their "Old Fashioned" heliotrope from seed. The Marine one's scent is described as "light", while adjectives for the others grow more enthusiastic.
The wall has come down and been rebuilt (2017) and is already on its way out again (not the stone mason's fault), but if I can get heliotrope going there again, maybe it'll be the fragrance that survives the stones.