Posted: 17/09/2017 at 12:41
Personally I wouldn't, I collect all my own seeds and grow hundreds of Nemesia every year, IMO it looks and behaves better than Lobelia. They don't come true from seeds but as you can see in my photo here, the colours are just as pretty as in the picture of the Seventh Heaven.
its up to you entirely of course, if you have the money spare then go for it, you will collect thousands of seeds next year. Can't guarantee colours but for me they are all equally as pretty.
this was in August but they are still flowering now, so a good all rounder.