A landscaping timber unit comprises a plurality of hollow extrusion units and a pair of end caps. Each extrusion unit extends longitudinally from a first end to a second end thereof and has a bottom wall and an opposite top wall, and has opposite side walls extending between the top and bottom walls. The top, bottom and side walls collectively form a substantially rectangular cross section when viewed along the longitudinal axis. The extrusion units are stacked upon one another with their respective first ends proximate to one another, with their respective second ends proximate to one another, and with their respective longitudinal axes substantially parallel to one another. One end cap is affixed to the first ends of the stacked extrusion units, and the other end cap is affixed to the second ends of the stacked extrusion units. Each end cap has a first end configured to receive the end portions of the stacked extrusion units and a second end that includes an aperture for receiving an elongate rod-shaped spike therethrough. The end of the timber unit can be secured to the ground by driving the spike through the aperture into the ground.
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