As far as I know, it's not. But, I would probably want to replace with something else just in case it's a bad batch of seeds or the breeder made a mistake in packaging or some other weirdness has happened.
I've seen good logs on Blue Treacle & had people on other forums I'm friendly with grow it out. Lots of good comments - that's why I'm leaning towards maybe the seeds got mixed up or something.
They look and smell great just like the picture, first 5 weeks beautiful, then they just freeze just before buds take shape.
what would you suggest replacing with?