I found your article interesting too. I love Baby's Breath. I have yet to really get a nice patch growing. The traditional Baby's Breath never comes back for us. It is nice to learn of the other cultivars. I would like to try growing the creeping baby's-breath, G. repens (zone 4) that you mentioned, especially if they get a blue tint to them. I'm zone 6b though...not sure if it would grow here.