Wild outdoor cane, also known as giant reed, is fast growing, fast spreading and quite difficult to eradicate. It is almost impossible to kill off a population by merely digging it up, since one remaining rhizome can start the whole problem again. Defeating giant reed requires the use of multiple tactics by a patient and vigilant gardener.
Cut the stand of giant reed down to near ground level with a scythe. Clear away and dispose of the reeds or put them in a bin to dry for a two to three weeks before composting them.
Boil a large pot of water. Put on long pants and gloves.
Standing uphill of the target area, soak with boiling water the ground on which the cane plants were growing. Cover all the ground immediately under the cane plants, being careful not to miss a spot. Apply a second dose of boiling water if necessary.
Check on the cane stand every day for the next two weeks for new shoots. Douse any new shoots with boiling water.