A spacer can be anything that occupies space. A good spacer would be light and have smooth walls as to not damage any roots upon removal. If you anticipate a rhizome will be 3 liters then adding 3 one liter objects would equal the space your mature rhizome would occupy and can be removed independently when the space is needed. In North Florida we use spacers that can also warm the rhizome during the winter months so that the fruit can continue to fill properly.
