Composted conifer bark (or "pine bark") is an organic material that contributes nutrients and also functions as a storage place for moisture. It decomposes relatively slowly but just quickly enough to supply nourishment for the tree.
Purchase one bag of conifer bark for $8.99 or purchase three bags for $24.99 and save $1 per bag.
Quantity per bag: 1lb is approximately 6 cups of conifer bark