I've grown out a fair amount, including doing a small seed run. All of mine have had purple flowers.
@Mossy Have you had the pleasure of testing Stone x Duurty? Very nice meds for meself.
Not sure if there are any Blood Dragons seeds floating about (Black Dragon x Duurty Dragon). I did track some down, but only ended up with two un-sexed plants in my veggie garden. In my future auto breeding projects is to make a Blood Dragon V.20. All of the Blood Stones I have grown out and reproed all have dark purple flowers. Another great med strain. Dragons rock!