This post is about how I built hanging flower boxes for my master bedroom! I decided to hang them because I have egress windows so I couldn’t put them on the sill where the crank handle is. At 27 inches wide I knew I could use 1x6s cut at that length and then a 1×4 in the bottom creating the depth. I gathered my materials and cut all of my pieces before assembling. To assemble I used my brad nailer with my air compressor, you can use screws in this case but make sure and pre-drill before hand, anything that’s only the depth of a 1x will split. Once assembled I stained them with Minwax dark walnut stain and added some old wood to the fronts for character.

I caulked all of the inside seems (that is just a gray pure silicone caulk I had on hand) and then pressed a garbage bag into every corner and nook and crany and then cut off the excess. I then added even more caulk along the top edges (and that is just a clear pure silicone caulk that I also had on hand) to keep the garbage bag totally in place and let it dry over night.

Step 1: Making Them Water Tight and Planting

To plant I added a second garbage bag (just to be sure I was TRULY water tight) and a layer of pine cones for both drainage and to help keep the weight down. From there I just used regular potting soil and planted.

I pre drilled for the hooks and purchased BIG ones to make sure they would go up through the trim board and well into the window header. From there I used 3/8″ sisal rope and it was just the job of cutting four pieces to length according to where I wanted the boxes to hang in the window. With them cut I tied a knot in them all at the same place and looped them over the hooks.

Step 2: Hanging and Finished Boxes

I sure am happy with them. I gave myself nearly two months to take the after photos and publish them here on because I wanted the vines to have a chance to grow a little. In my head I imagine those vines spilling all the way down the window someday.