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This has to do with size of the plants, depending on what they are and where you get them - varies from place to place. The normal range for pots sizes is #1, #2, #3, #5, #7, and #10. Generally speaking, the larger the number, the larger the pot, and usually, the larger the plant. Most shrubs/trees are at least a year old prior to selling them. Here is more information: https://www.gardeningknowhow.com/garden-how-to/shop/nursery-containers.htm

Spring and early fall are the best times to move plants. The key is to do your best to keep the plants from going into shock. This article will help you with that:
https://www.gardeningknowhow.com/plant-problems/environmental/learn-how-to-avoid-and-repair-transplant-shock-in-plants.htm

Can you give us some more information?
Type of shrub? Are the leaves yellowing?

This could work for small dwarf trees, such as a dwarf citrus tree.

If you are looking to plant an ornamental type tree, you will likely need a larger container.
Here is an article with more information.

https://www.gardeningknowhow.com/ornamental/trees/tgen/growing-trees-in-containers.htm

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