Yeah, that's a little cold for a Monkey Puzzle. I'm struggling with mine in a pot although the tree in the ground was good for 50 years.
I was thinking of getting more seeds but after 15 years, my potted tree is only a couple feet tall. On the other hand, I don't need to worry about it outgrowing its container.
If the Monkey Puzzle project doesn't work, I'll think about more seeds.
My new project is Ginkgo biloba. I ordered a Ginkgo biloba 'gokusho-ba' from a really good nursery about a month ago. It finally arrived last week but a branch had been ripped off pre-shipment leaving a big hole in the trunk about 1.5 ft from ground level. I doubt the trunk will heal to hold up an entire tree so I thought I would cut my losses by removing the top before it has a chance to remove itself.
So,... I've been reading up on Ginkgo propagation. It doesn't sound too difficult. My book says use "elongating terminal shoots." The way Ginkgos grow in spring, I could have millions of trees in no time at all!
Yes, I did contact the nursery. I have ordered from them before and their trees are always wonderful and well worth the price. The Customer Service lady gave me a 25% discount and extended their warranty from 45 days to a year. She also told me it would heal and be fine, just use some pruning seal. As I got essentially half a tree, it seems to me a 50% refund would be a better enticement to get me to shop there again.