i plan to cut a cypress of mine down from 5' to about 2.5' and want to save and grow the top. where i'm chopping is about 1 1/8'' in diameter. would i be significantly better off air-layering this, or are my chances of it rooting as a cutting pretty good? and if just cutting is fine, when is the best time of year? i read conflicting reports but my guess is late winter.