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48in. Slate Grey Supreme Fiberglass Window Box

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Make your next window box lightweight, sturdy and low-maintenance all around. The Supreme Fiberglass Flower Boxes are all of these things, from their high-strength extruded fiberglass construction to rot-free resistance to moisture. Supreme Planters also include a custom drainage mat specifically sized to the 48" window box. This piece channels runoff through the container bottom to push it out of drainage holes in the end-cap. Virtually no risk of over-watering, and the mat keeps air circulation optimized for strong plant roots.

Display fiberglass flower boxes year round or store as desired. This smooth Slate Grey finish of this all-weather container is also easy to rinse for surface cleanings, inside and out.

Online orders come with a trio of wall mount brackets and bolts for standard mounting surfaces. This container is also available in other sizes and colors online, or can be custom ordered to most any length measuring 14' and under.

48" L x 8 1/2" W x 9" H -Includes (2) Brackets 

Fiberglass Window Box Dark Green Dimensions Hooks and Lattice 

If you'd like a more decorative look to your windows, consider these wrought iron window box brackets below.  Simply locate our different styles on the right side of this page and click to review or add to your shopping cart.Using these shelf-like brackets allows your box to be mounted further from the wall frequently allowing clearance from window trims and other trim boards.
Wroght Iron Window and Flower Box Mounting Hardware
  • French Shelf Bracket Pair- creates a 8 1/4" Shelf

  • Scroll Shelf Bracket Pair - creates a 8 1/4" Shelf

  • French Shelf Bracket- creates a 11 1/4" Shelf
Finish: Powder Coated in Textured Black
Our line of Supreme Fiberglass Window Boxes come with wall brackets to hang your window box beneath a window on your home. Bolts are included, but if you are mounting the box to a stone/brick home, you will need to purchase lag shields separately. Diagrams are shown below so that you can see how the boxes are mounted to a wall and to a railing. To explore additional mounting hardware, including brackets for hanging the box from a railing, visit our Optional Brackets (For Fiberglass Supreme Boxes Only) page.

Fiberglass Window Box Installation from Hooks and Lattice