I have 4 closely-grouped cordylines in my garden, which were put there by previous tenants. I think they must have loved plants but had little clue as to cultivation, or horticulture in general... They're kind of...'plonked' in the middle of the lawn, without any kind of definition or 'structure' to their planting.

So here's the question:

I intend to "move them". That is to say, saw them off at ground level, (They have 'trunks' varying in length from around 6" to about 18") then plant them up in appropriate and correctly-mixed compost, (I dip the ends in rooting compound) and letting them root and establish. (Don't worry, I've done this before.....) However, underplanting is always a problem, because it's always very dry under cordylines... so what would you folks recommend? Houseleeks? Sedums? what....?