Glad to hear you're making progress with different trees. This year for me was a bust, with the move out to the country,trying to sell a house, busy at work and being pregnant, nothing got done this year as far as propagation/seeding...to be honest, I barely got anything out of the garden. There's always next year right? Haha!
Anyways, I started tasting bur oak acorns to try and find some that were palatable, and did find some at Wiggins park in Saskatoon...I don't know if this weird season is what made them good, but there was no bitter tannin taste whatsoever, it was truly bizarre. I gathered some and will keep you posted on how they taste next year from the same tree. Also, if you want Limber Pines, go to the corner of Broadway and 12th street (5 corners it's called) and there is a huge planter that contains about 4 or 5 mature specimens. Bring a trowel and simply dig out as many seedlings as you want, they're usually between 1 and 4 years old...I was there a few weeks ago and they were looking good, I just never got the chance to go back yet...I'd rather someone takes them to grow out rather than them getting weeded out by the city next spring! I've been doing this for years! I found a few more sugar maples growing throughout the city, but haven't been by any lately to collect seed...I could give directions if you're interested. I have a northern catalpa on my boulevard that seeded lots this year, could be something worth trying, has not died back in about 5 years. I hope to work with you someday (sharing seed etc) to get a nice variety of reliable food trees for our region. I'll see if I can get more Mandchurian Walnuts again this year, they sometimes take a few years to germinate when you don't prepare the seed well, so the sooner the better! I would like to get some butternut someday when I have some places prepared to plant them. Good luck!