repotting

soltan

Here is a comparison of two elm trees. The normal looking one was repotted trained and fed normally for 28 years. The one that looks like it is growing out of an exploded golf ball was trained and fed normally but never repotted in 28 years.
The non repotted one needed extra watering apparently often twice a day but no extra feeding.
This shows that a tree can survive many years without repotting providing you give it extra watering.
I might suggest dunking the pot to water to ensure it gets enough water.

There is a summer repotting time when the growth of the tree has stopped but It can be hard to spot and not reckomended for beginers.

You say the pot is too small this makes me think that you just want more room for the tree to increase growth or to improve the look. It is possible most any time of the year to slip the tree into a bigger pot. Even if this was to disturb the roots if they were loose in the soil it should be okay as long as you do not remove any roots.

Early spring just before bud burst is the safest time to repot for many trees including the elm and is when the most drastic root pruning and manipulation is possible.
As stated pictures will help in advising what you can acomplish at the moment.

Attached Images

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