Three years ago, on October 25, 2009, I cross-pollinated marmorata and julii (marmorata pollen onto a julii blossom and vice versa).
I took this picture to remember which plants I had pollinated which each other:
Lithops julii and Lithops marmorata after cross pollination on October 25, 2009
To my surprise it worked and the Lithops julii grew a seed capsule.
(The marmorata did as well, but I have not yet opened it. I should be able to find that seed capsule, too, with the help of this pic. I've always wanted to repeat that photo series I took of the julii seed capsule opening... maybe I'll do that with the cross pollinated marmorata capsule and then sow the seeds.)
I opened the julii seed capsule on July 23, 2010, harvested the seeds, let them dry and then put them into a small envelope with the date and the name "julii x marmorata" on it.
I didn't get around to sowing those seeds until this year. But Lihops seeds are known to stay "fresh" for a long time.
On April 29, 2012, I sowed them and lots of them germinated. I am beyond thrilled that this actually worked and I hope and pray that I can keep them alive!!!
Here are my own self-made little miracles:
Lithops julii x marmorata seedlings on May 28, 2012