If you plan to grow large trees or shrubs, you need an equally large container. It must be in proportion with the plant and must blend in with the design of your garden.
There are a number of things to think about when considering large containers. Many large plants, trees and fruit shrubs will need as large a container as you can provide, if they are to flourish and attain anywhere near their potential proportions.
Larger plants are best grown in raised beds or in special large containers chosen so that they fit in with the overall design of the garden. Even large containers need to have drainage at the bottom and an automatic watering system is of great assistance in keeping the plants moist.