Latt,
I know where I live in Maine, the ground freezes atleast 3 inches down or more. The thing I have noticed, is seeds that don't get good soil covering them, they tend to dry out and die. But seeds that are covered with soil seem to emerge just fine after they have been frozen during the winter.
Here is a couple of things I found online about seeds freezing.
\"Although spring planting of stratified ginseng seeds is possible, it will not have as high of a successful germination rate as fall planting. Ginseng seeds benefit from exposure to freezing conditions, and ideally they should be planted in the fall when local trees begin losing their leaves.\"
And another: from Glacial Ginseng Co.
\"Quality of Seed: The most important thing here is seed germination. If your seeds are fresh from the stratifying pit and have been properly handled, your yield is going to be much higher. Ginseng has an 18 month gestation period. The last 6 months are the most important. In order for the seeds to properly develop, they must be exposed to freezing and thawing conditions such as occur naturally in the spring of the year. If the seeds have been kept in storage and not exposed to the temperature changes, your yield is not going to be there. The moisture content is very important. If the hulls on the seeds have been allowed to dry, you're just wasting your money.\"
I agree that seeds that are planted in the fall will freeze in the ground during the winter and they germinate just fine. But I don't know what affect freezing the seeds in the freezer will have on germination. It makes sense that they would do fine, but I have not heard of anyone trying this.
classicfur