mnorell

Make sure the rhizome is potted in a mixture of about 60% sand, 40% light peaty potting mix, such as Miracle-Gro Potting Mix. Keep it just barely damp. In heavier, wet soils, it will most certainly rot. Keep the plant warm and I would suggest just misting it occasionally rather than watering; also if it's small enough, you could just put it in a large ziploc baggie to create a mini-greenhouse for it. Put it in a warm window with sun striking the root-zone. I sprouted many rhizomes with this soil mixture in black nursery cans in hot reflected sun last March/April and didn't lose a single one.