soonami

Stratification is effect for many types of tree seeds. Except for tropicals, most tree seeds benefits from stratification because often seeds contain enzymes that inhibit germination until certain temperature barriers are overcome before seedlings can emerge. If nothing else, putting seeds in the fridge will allow you too germinate them all at about the same time so you don't have some break early and some taking weeks or months longer.

Some seeds that you buy may already come from dealers stratified and read to sow as refrigeration is often needed to maintain the viability of seed.