canada wild plum stratified winter 2023 then again in 2024

canada wild plum stratified winter 2023 then again in 2024. the first year maybe 40% germinated, this spring the other 60%. this is why I like to keep large seeds in the bag until they start to germinate, sometimes the dormancy is so deep they need two cycles. I should note, every species of plum I grew last year did this, and I have left over bags of all of them sprouting. waiting to see if the same is true for walnuts.