scarification & stratification
Often, I can't find any info to tell me if the native milkweed seeds I buy from quality sources need to be stratified or scarified. Not to mention keeping those 2 terms straight. For Asclepias erosa seeds, from plants, do you have a suggestion to either stratify or scarify? Thank you
Certified GKH Gardening Expert
Stratification would be exposing it to a certain temperature range (usually cold). Scarification would be nicking the seed coat. Both are methods for overcoming seed dormancy.
Now... There seems to a lot of argument on whether this particular species needs a cold period to germinate. They do not need a scarification. The best thing I could suggest would be to put some in moist soil in the refrigerator for a few weeks, and some planted directly to see which has a better germination rate. There may even be no difference in germination rate.
This article will give you a little more information about the species as a whole: https://www.gardeningknowhow.com/ornamental/flowers/milkweed/milkweed-plant-varieties.htm