I have harvested it alive, but i bet you could harvest it dry as long as it's not been too wet. I think it's best to harvest it at its peak height and before it starts to yellow or loose leaves. I process it similar to dogbane: first squeese it hard to split it into 4 quarters. next take each quarter and prob'ly split it again. next take each split hold onto it one inch(or less) from the end and bend it towards the bark till it breaks, then move your grip down the piece an inch and bend again. you are just breaking the pith, not the bark. After making breaks every inch, pick off the 1 inch sections with your fingers. next rub or pick off as much of the flaky outer bark as you can leaving mostly the silvery strands of fiber (inner bark). to get off the outer bark you can bundle several splits together and roll them between your palms. you can also use it with the outer bark on- your cordage will be a little lumpy and rough.