Choosing the right size pot is the decision everyone researches. What happens the day the tree actually goes into it gets skipped — and that is where most first repottings go wrong.
If you have not read it yet, start with what size pot you actually need for the sizing conventions. This picks up from there: the tree is sized, the pot is in hand, now what.
Prep the pot before the tree ever touches it
Cover the drainage holes, don't block them. A small square of plastic mesh over each hole keeps soil in and roots from growing straight out through the opening, while still letting water run free. Wire mesh works too and lasts longer, but plastic is cheaper and easier to cut to a pot's actual hole shape.
Use the wire holes if the pot has them. Thread a length of aluminum or copper wire up through the drainage hole, across the mesh, and leave two ends standing proud inside the pot. You will use them in the next step. A pot without wire holes still works — you just tie the tree in from the rim instead, which is less secure on a top-heavy specimen.
Anchoring the tree
A newly repotted tree that can rock in its pot is a tree that tears its own new root growth every time the wind or a bump moves it. This is the single most common cause of a repot "not taking."
Cross the two wire ends over the root ball at the trunk base and twist them snug — not tight enough to cut bark, tight enough that the tree does not shift when you nudge the trunk by hand. Test it before you add another grain of soil.
The soil itself
Bonsai soil is not potting soil. It needs to hold some moisture without staying wet, and it needs particle size consistent enough that water actually drains through instead of channeling around compacted fines. Most growers work from a mix of akadama, pumice, and lava rock in ratios that shift by species — conifers want it draining faster, deciduous and flowering trees tolerate a bit more moisture retention.
Work the soil into the root mass with a chopstick or root hook as you fill, not just poured on top. Air pockets around the roots are as damaging as waterlogging — a root touching nothing but air dries out and dies just as fast as one sitting in standing water.
The first two weeks after repotting
This is where the drainage decision made months ago at purchase either pays off or does not.
Water thoroughly at first repotting, until it runs clear from the drainage holes, then hold back. A freshly repotted tree has fewer intact roots to take up water than it did the day before — overwatering a tree with reduced root capacity is how a pot with excellent drainage still ends up with a rotted root system.
Keep it out of direct sun and wind for one to two weeks. New feeder roots have not formed yet; until they have, the tree can only lose moisture through its foliage, not replace it through the roots. Filtered light and a sheltered spot let it recover before it has to do real work again.
Do not fertilize for at least two to four weeks. Fresh-cut roots take up fertilizer salts poorly and can be burned by them. Wait for visible new growth — that is the tree telling you the root system is functioning again.
What good drainage actually looks like in practice
Pour a full watering through an empty pot before you ever plant into it. Water should appear at the drainage holes within a few seconds, not minutes. If it pools and sits, the pot's holes are too few or too small for the soil mix you are planning to use, no matter how well-reviewed the piece is — and it is worth sizing up the hole count rather than fighting it with soil mix alone.
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