Seeds that Like Cold Stratification

Some seeds require a period of cold to germinate, a defense mechanism so they don’t germinate too early. I find that quite a few perennials and self-seeding annuals that originate in northern climes require this period of “cold stratification,” during which a seed might go through a series of freezes and thaws before a sprout emerges. We can control some of these processes by planting outdoors in the fall or simulating the chill by placing the seeds in a damp environment and placing them in the refrigerator for a month or two or more. I find it most useful to cold stratify seeds in pots if planted directly outside – or to plant them in pots once removed from the fridge – simply to keep track of the new plants, because they are often slow growing and would get lost in the fast-growing weeds of spring. I can then transplant them to a more permanent location once they are big enough to hold their own.

This list is by no means all inclusive! It is only those that I now have growing, have grown in the past, or intend to start. If you find errors or additions, please let me know. (Thank you!) I am hoping this list will be of help to others, but as always, be sure to do your own research!