If there is a vendor who sells hbwr seeds as botanical samples, those seeds would be viable? Afaik everyone who buys them do it so they can eat it so I'm not sure it is good for growing as well. Also, I think it would be best to start the growing at spring. Should I wait with the purchase or that half year really doesn't matter, they can survive that long before I start the growing?
Also are there any alternatives to pereiskiopsis for cacti growing? Is it good idea to graft peyote on san pedro?