Some may disagree but I think you'll be okay leaving them in the one gallon pouches until fall. I would then put them in three gallon pots for the ones you overwinter. Then you will probably need to go a size bigger about mid summer next year.
Matt
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I agree with this as well.
I don't have near the growing season as most of you, or the heat, so maybe its an opinion that doesn't matter coming from me.
I usually do about 150 or so chestnuts each fall that I started from seed. I am transplanting most from the RM 18's the past week (Mid May) and I put them into REGULAR 1 gallon pots. (The ones that are frowned upon) I then move them into my nursery that gets about 5 hours of full sun/day elevated on pallets until September when I plant. I use Osmocote in the potting soil and check in on them about once a week to see if they need a drink. I will try using the MG acid on 25 or so once or twice a month like Wayne suggest and see what those trees do. I assume they will respond great ! That stuff is cheap enough and not much of a hassle to water with, so that is right up my ally with my growing style!
I usually end up with a nice 38-42" tree with a good root system. I don't see any real spiraling issues unless I overwinter them and plant the following spring. I do another 25 in 1 gallon air pruning pots (the ones with the vertical slits) just because I tested the difference. I get a little bit better tree from the air pots. Slightly with height, but noticeable better diameter. By the 3rd year in the field I can't tell the difference between the growing methods. I would probably push into that 55+" range if I went 1 gal RM, then to 2 or 3 gal in stages like suggested. Maybe in a few years I will tinker with investing a bit more into growing bigger trees when my kids need less attention :-D
The reason I do this is because I use a 6" power auger to plant. The 1 gallon regular pots fit perfectly in the augered hole and I can plant 150 and tube them in just a few hours with a buddy. The trade off for me with time in the field/expense is a no brainer in my situation. I'm sure I could get a better tree if I babied them more, and used better potting methods, but those all come at a cost, and the cost of time which I don't have at this point in my families lives.
The trade off is that I could do less trees and plant bigger ones. I don't see the difference a few years later with our short growing season , So I believe 10 years from now, I'll be super happy with planting for volume, saving money, and less time involved if a mouse finds its way in a tube once and a while