A couple of years ago, I successfully germinated some dragon fruit seeds within 3-4 days of sowing. It was the common white fleshed ones - Hylocereus undatus . About 2 weeks ago, I got some fruit of Hylocereus megalanthus yellow dragon fruit from Ecuador. I used the same method as in the common ones. It is almost 10 days now, but not a single seed germinated.
For the first 7-8 days, the seeds were in a room with only diffused light and no direct bright light. Could the intensity of the light be the problem?
OR
Another thing is that I removed the transparent jelly-like sead-coat (testa?) before sowing. Does this affect germination?