TRANSPLANT/REPOT FROM 5 gallon GEO-POT to 20 gallon GEO-POT

Ok so I have been very lucky with my last minute decision to do an outdoor natural outdoor experiment/project. It took off from the start a has shown great signs off a happy healthy girl who can't wait to grow up. So my biggest issue has been her rapid growth with her only having the one repot since germination she was quick to reach the sides of her 5 gallon GEO-POT I have put pics to show. Anyway I now need to upsize her foundations and have decided on a 20 gallon GEO-POT I just want peoples tips and tricks and advice as to the best way to go about moving her from one GEOPOT to the other. Like time of day is morning or night best, cold warm or hot weather best when reppoting? Moist, wet or completely dry? I have used coco noir or peat as my growning medium with perlite. Where should the base of the stem sit in new pot any tips and advice would be great..cheers!

Dry it out a bit so you can do a full water when you transplant. I have many fabric pots and like the geopots, the velcro makes transplanting much easier. Good luck!