@Jai_Ganesha
There are several Adenium Facebook groups where you can buy quality seeds. I understand that we want to give our seedlings the best possible growing conditions but with all due respect why make everything so complicated? Adeniums & Plumerias don't need anything special and or sterile. Simply germinate them in a paper towel (moist them with regular tap or drinking water) in temperature above 65F. Once they have germinated plant them in a fast draining (coco coir, compost & pumice) mix. Hope it helps.
