165 days after sowing and still only 1 out of 12 seeds germinated. This little 2 months old seedling has developed a caudex the size of a pea already.
I decided to change my germination method, hopefully to speed up the process a bit. I dug out all of the seeds I could find (found 4, but one went down the drain when I cleaned them over the sink..) and went for the “wet tissue in a plastic bag” method.
EDIT (April 10 – 2017): Received 3 additional packets with 18 D. Elephantipes seeds and placed 6 of the new seeds in the wet tissue today.