How To Build Window Flower Boxes

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Nathan used stock 1”x10” Azek and stock Azek band molding and base cap molding to build three identical window boxes. To cut the materials to size, Nathan used a sliding compound miter saw which is manufactured by Dewalt. To secure the front, back, bottom, and side pieces together, Nathan used 2 part PVC glue, 1 ¼ - inch brads, and 2 ½ -inch stainless steel trim head screws, which can all be found at home centers. He secured the molding with 2 part PVC glue and 1-inch brads. To allow for drainage, Nathan created drainage holes on the bottom of the window boxes. He used a ½ inch spade bit to drill holes every 8 inches along the centerline of the bottom piece of Azek.

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Nathan mounted each window box directly to the house’s siding. He pre-drilled pilot holes, added caulk into each hole, then used 4-inch structural screws to secure the box to the clapboard through the pre-drilled holes.
Jenn lined the window boxes with one layer of landscape fabric, which can be found at garden and home centers. On top of the landscape fabric, she added handfuls of Volcanic Lava Rock to cover the drainage holes. Jenn used a combination of annuals and perennials to fill the window boxes, which get morning sun and afternoon shade. Plants and flowers used include Northern Maidenhair Ferns, Pearly White, Glacier Ivy, begonia, bush violet, and vinca, which she planted in Fox Farm Ocean Forest potting soil made by Fox Farm. In addition to regular watering, Jenn suggests using a slow-release fertilizer like Osmocote—made by Scotts Company LLC. once every three months to help keep the window boxes healthy.