Has anyone any experience growing Think different & barneys blue mammoth ???

I finally got around to planting my Think different, & Barneys auto blue mammoth & Im just wondering is it normal for them to take weeks to sprout ??? None of my others are this damn slow, its like their froze in time or something & I have been dying to try these. This has been a total disappointment to me..

look around i just saw 2 threads on the auto BM