WholeTree is a growing media component made from all parts (bark, needles, wood and cones) of the loblolly pine (Pinus taeda). The product was developed by researchers at USDA-Agricultural Research Service and Auburn Univ. In 2005 and 2006, ARS, Auburn Univ. and Young’s Plant Farm, wholesale ornamental plant grower in Auburn, Ala., entered into cooperative agreements to develop the substrate.
The pine trees used for substrate are harvested from pine plantations at the thinning stage. The trees are chipped and further processed to achieve the desired physical properties needed for the substrate component.
Field and laboratory studies have demonstrated the successful use of Whole Tree, even at 100 percent for some plants. Young’s Plant Farm is producing its own substrate component. The company is growing and harvesting pine trees at one of its farms to make WholeTree.
Additional research is being conducted to evaluate the use of WholeTree in vegetative cutting and seedling propagation of perennials and woody ornamental crops. Plants that have been trialed include garden mums, salvia, climbing rose and Leyland cypress. Wholetree will also be looked at as a possible landscape soil amendment.
Scientists are planning to conduct additional plant growth response trials at other commercial grower locations in the Southeast. They will also be looking at other tree species growing in southern forests as either standalone substrates or as substrate components.