Many trees will grow well in big pots provided they have sufficient room for their roots.
To ensure their good health you should always buy the best quality outdoor potting mix.
The bigger the pot you buy the better, within reason for the size of the plant you intend having in the pot and also provided your budget can stretch that far.
This will ensure your plant won't out grow the pot too soon or at all.
If you will need to remove the plant/tree as it grows bigger, you should take special care in selecting a pot that is shaped in such a manner that the contents will be able to be removed without having to break the pot.
Tapered pots will make this easier whereas pots that are wider in the middle than the top can present problems if the roots have spread out.
Don't fill the pot to the top with potting mix, as this won't leave any room for effective watering.
You should also feed your potted tree with some slow release fertilizer two or three times a year to ensure it is getting good nutrition.
Plants in pots can dry out and not get enough moisture so it is also a wise move to give them some water storage crystals and a wetting agent.
This will help to maintain the moisture content in the soil.
If the pot is in the sun it will need more water, depending on the type of plant you have in the pot.
Darker colored pots will also attract more heat and this can affect the growth of your plant so you need to consider where the pot will be to ensure there is sufficient sun light and also enough water for it to survive.
