Hi there, my twopenneth?
I appreciate that we baby our beloved plants along and want to give them 100% chance of growing, but my approach is now to sow more than I need directly where I want them to grow. They are stratified by nature. Interestingly, hawthorn eg generally needs a 2 yrs cycle, so patience required. I have had some success freezing the seeds, bringing them out to warm up and freezing again, but I'm a bit scatterbrained and often lose them in the freezer, or forget which is which (no. I've never heard of pen and paper. What's that? 🙈) Plants that are difficult to get rid of eg nettles, don't need any help. Just sow the seeds and protect, transplant a few clumps and let them self sow. I do think we sometimes make life more difficult than it needs to be. Having said that, I'm in northern Europe, which possibly presents less problems for me. You guys are maybe in the US and Canada? so you are the experts in your areas. Blueberries grow easily here. Though I prefer the original wild ones, or Bilberries as we call them here. Scotland gets the coldest temperatures usually and they grow there in the worst conditions. As for trees, notwithstanding that some are easier to grow than others, the forestry commission puts seeds in plastic bags of damp sand, which are overwintered outside in critter proof places. Nature then does what she does best. I appreciate it's probably harder for you.