Those given in J.D. Vertrees Japanese Maples were estimates based on the growth habits of young trees and in the 23 years since first published many have been shown to be far afield. However, since most growers have limited access to mature specimens, particularly new introductions, tree heights once recorded in a book or catalog are quoted as the gospel and continue to make mischief. Hardiness is primarily governed by the rootstock on grafted plants. Almost all Japanese maples are grafted on species Acer palmatum rootstock so they share the same limitations. Roots can be damaged if allowed to freeze below 14 degrees F. and high winds and intense sun can desiccate trees with frozen roots.
All maples adapt readily to containers - from half whiskey barrels to bonsai.
The demands increase as the size of the container reduces. The growing medium must provide good drainage. I find a balanced liquid fertilizer applied at half strength in early spring gives them a good start. When containers approach bonsai sizes the soil mix needs to be altered to those recommended for bonsai in each climatic area. Re-potting is dependent on container size but trees can be kept in the larger containers almost indefinitely.