because I knew nothing about this plant (see my previous response that proves I knew nothing) I looked it up and apparently in New Zealand the:
Leaves were cut near the base of the plant using a sharp mussel shell or specially shaped rocks, more often than not greenstone (jade, or pounamu). The green fleshy substance of the leaf was stripped off, again using a mussel shell, right through to the fibre which went through several processes of washing, bleaching, fixing, softening, dyeing and drying. So now you need to get some mussel shells - simple really.
R