How to make a Sub-Irrigated Planter. I'm not sure I would use a two liter plastic bottle though. Over time I would fear the plastic breaking down enough to poison the plant. Perhaps a wine bottle instead.
"How To" - from Ginger Photo Self-Explanatory Grow Ginger from Cuttings Growing Ginger is SUPER EASY! I put some in a clear 'air tight' container in my counter, and just the other day went to add a new piece I had bought to