Precious seedlings

When we went to Canada two years ago, cousin Barbara showed me her orchard out in the Rockies. She had some sour cherry trees, the ‘Evans cherry’ prunus cerasus, which she said are self pollinating and extremely hardy, surviving the intense cold of their winters. They are native to Canada and were much prized by the First Nation people. Barbara produced a cherry pie made from some of the previous year’s frozen harvest, and it was delicious!
I was so impressed I asked her if she could collect me some cherry pits to try and grow back here.
To my delight some months later a package arrived with assorted gifts and tucked into the pair of mittens was a small bag of stones!
I planted them the following spring and watched them closely but to my disappointment nothing happened so I forgot about them.
Then after this winter, as I was watering the various pots in the cold frame, I spotted some leaves emerging from an unmarked pot. I kept an eye on it and then began to wonder if it just might be those cherries...
Finally a seedling appeared in the pot I had labelled and it was the same!
So now I have six little seedlings and they are still appearing! Obviously they needed a cold snap to set them off germinating, which seems reasonable given their origin! I hope they will thrive and if I have a surplus I will let you know!