Stratifying seed record frost heave

Exactly 3 years ago, we were having the coldest winter ever. I stratify (cold treatment) a lot of seed of perennials under a cold frame in the garden. I’d never seen frost heave like this before in these seed trays, tripling volume like a good loaf of bread…Unfortunately, it had also heaved a lot of the labels out…
Here, Crambe koktebelica from the Ukraine and Russia from Alpine Garden Society seed, a potentially interesting perennial vegetable…..but, no plants resulted from this attempt!

 

 

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