FYI, Natures Footprint is located just off the Mt Baker Highway. But here’s the kicker, the owner gets his pumice from Oregon and brings it back to Washington mainly something to do with worms.
I used get my pumice directly from him until he ran out. He is very “flaky”, doesn’t return calls.
My new source has all the pumice I could ever dream of.
If you want the best for your trees, I have it. $50 1/2 cu ft (USPS large flat rate box) washed and dried any grain size. check out link below 
Sweet! I will say that NF’s pumice is usually unwashed and quite gritty. Typically I’m using it for Yamadori or dev boxes, so that’s fine. It would be nice to have some pumice that’s more ready to use though.
Do you sift and wash? Very important step for the aftercare of yamadori.
I have a few members order some of my pumice. It has more nutrients than the stuff from Oregon. My source had both his and Oregon pumice tested. It is quite a story on how he got this pumice.
You would probably drop your jaw if you saw the Natures Footprint property, it is post apocalyptic.
Never do either. Yamadori has been fine though. All deciduous, so not sure if that matters. They can handle the moisture plus the heat here dries things out fairly rapidly. If I lived in an environment that was a lot wetter then I’d sift and wash.
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As no expert on the subject in terms of doing this with yamadori, I’d suggest a very cheap black plastic bag, or a transparent/white one. I’m in the Mojave desert and we’re 70°F and up all week. Today my unheated greenhouse that is in terrible condition (doesn’t hold heat well…) hit 90°F, so I’d stray away from a black bag imo. Keeping it in shade might help as well. You basically are doing this to hold heat in the bag and to hold moisture in the bag. Too much moisture isn’t going to be a problem, too much heat OTOH is no bueno.
I live in Dallas, and I would caution you against using any temperature enhancements when outdoor temperatures get over 70 degrees. The black bag will cause about a 20-30 degree temperature differential between outside air and temperature in the bag. You will run the risk of cooking your roots.
Yep, this was something that concerned me too. But I have a thermometer inside my box and have noticed only a slightly higher temperature (~5°) inside than out. Perhaps it’s because I did a box instead of a bag? I’m not sure.
Also note that Harry Harrington said in his video that temperatures inside the bag can hit 30–40°C (86–104°F) without concern. That’s, of course, just his experience—may not translate to ours.
But let’s see! My tree has been in the bag now for a little over two weeks.
I’ll be interested to see the results!
Blessings,
Hey BOD ( @bigorangedrink ) how is your recovery going? I black bagged a few Elms at about the same time. I unwrapped them post stream last night. Lots of growth on 1 a few buds on another all others pass the scratch test so we will see. They are wrapped back up now, the onw with good growth is loose to allow some additional light and wind in.
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@moon —coming up on eight weeks since I dug the tree, six weeks since I bagged (boxed) it. I opened it today and can’t see any signs of growth, or bud swell, or anything, really. Some parts of the tree are passing the scratch test (attached image), some it’s harder to tell. I’m thinking about taking it out of the bag now, and moving to full shade—fresh air, indirect light. 42 days in the bag, not sure that longer is going to help. But I don’t know. Now I feel I’m just guessing. Thoughts?
I’m in a similar situation. The wind has been crazy this spring. Some show obvious signs. Others still scratch and thus I’m optimistic. I’ve heard it said that hope is the last thing to die in Bonsai. Fingers crossed 
fro both of us.