Best Product For Stratifying AZ Walnut

I found 2 wild AZ Walnut trees (Juglans Major) growing near me. I want to grow a bunch. What’s the best stuff to use to stratify the nuts? I have issues with molds sometimes and these nuts look like something that the molds would attack with glee.
Thanks.

awesome!

If it were me, I'd do just like I sprout apple, peach, apricot seeds. I stick them in pots of potting soil mixed with some worm compost on my sheltered patio and keep damp. They will naturally stratify over winter and most will sprout next spring. Tho I did finally get a cherry to sprout, 2 years later. Some tree seeds need more than one winter to break dormancy

One year I sprouted Black Walnuts loose in a covered container outside. The next year I tried to sprout them in similar conditions but covered the nuts with an inch of soil and failed.

I got butternuts (walnut family) from my uncle in the fall.  They spent the winter in the fridge in a ziplock baggie.  Planted them in potting soil in the spring and 4 of the 5 sprouted.  If I were to do it over again, I'd just pot them up in the fall and put them somewhere cold where the squirrels couldn't find them (garage) until spring.

I bought a bag of vermiculite and a gallon of water. Hopefully they won’t mold in the fridge.