I've never noticed any fragrance with them, but agree they are
splendid plants and far more effective than the closely related
bedding Lobelia. Happily, it is hardy here and self sows so in most
years there are plenty of blue stars peeking out wherever a plant
finds room to grow.
Dave Poole
Torquay, Coastal South Devon UK
Winter min -2°C. Summer max 34°C.
Growing season: March - November