Are there any dwarf cordylines?
Most of the hardy Cordyline australis types will grow very slowly in a pot, but grow rapidly form 4 years old if grown in the soil. C. pumilio and ’Red Fountain’ are two short forms that only reach 1m or so in height. Both are slightly tender. Some of the tropical cordylines (often used as houseplants in Britain) are slow growing, eventually to 1 or 1.5m height only in their native habitat.