The following links are a good source of how and when to re-pot your bonsai trees. Please keep in mind that the proper time to re-pot a Bonsai depends on where in the country you live. It is always best to contact your local Bonsai club for advice on the proper time to re-pot your trees.
Aligning containers with development goals by Jonas Dupuich New 02-27-2021
Apple Tree Bonsai, April 2015 by Nigel Saunders
Azalea Re-potting Summer 08 part 1, part 2 John Geanangel
Bill Valavanis: Repotting Begins! This is a great article by Bill on how when and what to do when re-potting a Bonsai.
Bare-rooting a trident maple by Jonas Dupuich New 04-28-2020
Bonsai Basics: Repotting a Bonsai Tree by Eastern Leaf New 08-03-2019
Confusion Over Fall Repotting- by crataegus Bonsai
Deciduous Bonsai training and health, Bonsai Boon by Bonsai Empire New 03-24-2019
Designing an Olive Bonsai tree by Bonsai Empire New 07-16-2019
Elm Bonsai Progression And Repotting by Harry Harrington (Bonsai4me) New 03-23-2020
Fall Repotting by Brent Wison
From Bush to Bonsai Cotoneaster, in 4 years by “Bonsai Tree (Pty) Ltd Online Store” New 12-21-2019
Graham’s Guide to Repotting Bonsai by Graham Potter Great in-depth article on the importance of re-potting!!
Graham Potter Repots Taxus Bonsai… in Shorts by Graham Potter New 08-29-2019
How to Repot Bonsai Trees – The Basics Video by Graham Potter
How to secure bonsai in the pot by Jonas Dupuich New 02-14-2021
Literati Prunus Spinosa ‘Fifty’ final potting from Duffet to Albright by Tony Tickle
Maple Bonsai repotting. Long version because we explain how to repot. by Bonsai & Killifish from Japan New 01-14-2018
Nix Pix Stix (The art of Chopsticks) by Minnesota Bonsai Society New 01-13-2019
Potting Collected Rocky Mountain Juniper – Ryan Neil by Minnesota Bonsai Society New 03-19-2018
Pot selection exercise – Japanese maple by Jonas Dupuich New 02-21-2021
Repotting a Beast! (Japanese Black Pine) by Peter Tea
Repotting a Bonsai: Monterey Cypress by Ryan Neil New 03-08-2020
Repotting a Japanese maple forest planting by Jonas Dupuich New 01-24-2021
Repotting a neglected atlas cedar by Jonas Dupuich New 01-24-2021
Repotting a Spruce Bonsai on a slab by Bonsai Empire New 05-30-2019
“Repotting” a Rock Planting by John Geanange
Repotting Larch by Mauro Stemberger New 03-22-2021
REPOTTING SABINA JUNIPER by Mauro Stemberger New 04-20-2021
Repotting Trick: The Plumb Bob by Michael Hagedorn New 03-17-2021
Re-Potting Tips by David Degroot/Minnesota Bonsai Society New 01-13-2019
Rhizotonic for Bonsai Roots by Bonsai4Me New 04-11-2019
Scots Pine Yamadori Goes Into It’s First Pot by Graham Potter
Securing a tree without repotting by Jonas Dupuich New 11-16-2020
Spring Italian Bonsai Dream Museum by Mauro Stemberger New 05-15-2020
The Mechanics of Repotting a Massive Bonsai | Bonsai-U by Bjorn Bjorholm New 04-10-2020
The Trophy 2021 – Repotting strategy by Ryan Neil by Bonsai Association Belgium New 03-21-2021