I've had others tell me Heather Grace is pod sterile, I don't have it so can't say for certain.
Wild Hair has refused to set a pod for me in the past two years, even with perfect setting conditions...nothing. Appears to be pod fertile for others, it's listed as pod parent to 3 kids. If it wasn't so darn pretty I'd threaten to toss it on the compost pile. That always seems to work for the ones that refuse to bloom....