You get one of these from Kniles the Magister in the Fort Joy basement, and I'm not sure where I got the second one from
Second rose is from Radekas cave - the only blood rose is from killing/pickpocketing Radeka herself.
Even the blood rose elixir buff you lose if you are resurrected (after death or when transitioning to different area) so the whole thing is a bit pointless as it doesn't last long.
I hope the roses are changed back to blood rose as they were before and the permanent buff fixed to be permanent. It isn't like 3 roses each giving +1 on attributes is that big a deal anyway - if you have a party of 4 it isn't even one each - and it is nice to collect things that continue to have value.
