The key to growing trees is not necessarily starting them super super early but LOTS of amazing soil and a hard core training program from the start.
These were spouted from seed in feb and then put into 400 gallons of my soil blend. Some of them did well over 7 pounds a piece. All 100% organic.
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Now can you grow a couple of pounds in a 5 gallon bucket? Yes... but it takes skill. This method you can just literally transplant and let them explode with little work on your part.
I scrog them from the start and then fim a few times and then turn into bushy beasts.
This yr I'm only doing 100 gallons that is why they are smaller.