These are 3 year old L.Williamsii seedlings using the take away tek method of germination.
Takeaway tek is the method i recommend for cacti seedling germination - you can even using take away tek to root P.Viridis leaves.
Because these guys are such slow growers I will graft one or two onto some T.Pachanoi.
These seedlings are in cacti and succulent mix. I live in the desert so I can afford to water more often.