Hardscaping 101: Window Boxes - Gardenista (2024)

How do I install a window box?

Unless it is freestanding, a window box must be securely attached to your house. It should be able to withstand high winds and other extreme weather. Hardware must be able to carry the weight of the box and wet soil. Installation methods and hardware will vary based on your facade’s material. The simplest kind of hardware are L-shaped brackets made of galvanized or stainless steel. A box can also rest on decorative wood or metal knee brackets attached to the wall below the box.

Installing window boxes can be done as a DIY project, but be sure to check on the type of hardware and techniques advised for your particular home exterior material. Expandable anchors can’t be used on brick because they can cause the brick to break apart. For stucco or plywood, use large anchors for wood. Again, we recommend consulting with your vendor for the installation recommendations.

Above: British gardening writer Isabelle Palmer has zinc window boxes mounted on her balcony railing. Photograph by Jonathan Gooch for Gardenista.

Have a balcony? Lucky you. Consider hanging window boxes from your railing. See 10 Easy Pieces: Hanging Window Boxes with Brackets.

Above: Window box brackets can be demure or decorative. They are available in different materials to complement your box. We like the sturdyIron Window Box Brackets(above, L; $26.97 a pair at Windowbox.com) and theTeak Windowbox Brackets(above, R; $14.95 to $19.95 per pair from Gardeners).

What window box materials are available?

Name a construction material…no doubt someone somewhere makes a window box out of it. Wood, plastic, zinc, copper, iron, tin, ceramic, terra cotta, wire, fiberglass–you name it, they are all available. I once saw beautiful window boxes made of rubber tote bags. After you’ve selected the style you want, take a look at the materials available. If your windows get bright sun all day, it’s a good idea to avoid dark-colored or solid metal boxes, which could heat up and become ovens to bake your plants.

(Stay tuned for our next installment, looking at the pros and cons of different window box materials. In the meantime see10 Easy Pieces: Metal Window Boxesand10 Easy Pieces: Wooden Window Boxes, and Design Sleuth: Terra Cotta Window Boxesfor sources.)

Above: Wooden window box in Brooklyn.Cypress, cedar, redwood and teak are less prone to rot than other woods.Photograph by Erin Boyle.

What are the best plants for a window box?

A window box is just another type of container, so it can be planted as you would any container. Plants with relatively small roots and limited space needs are best. Don’t forget about plant height. You want to enhance, not block, your view. Select a mixture of trailers, uprights, filler plants, and even bulbs. The best part of window boxes is how quickly they can change their look;you can replant your garden seasonally (or when the mood strikes).Here are some ideas:

Above: Erin Boyle shares her Tiny Fall WIndow Box Garden Ingredients. Photograph by Erin Boyle.