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72in. Slate Grey Supreme Fiberglass Window Box

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Keep curb appeal refreshed with a 72"-Long Fiberglass Window Box. Great for large picture windows and deck railings, this sleek grey planter lends a contemporary quality to container gardening. Each flower box is extruded from fiberglass materials that are at once durable and lightweight. The result is a high-strength outdoor planter that is rot and mold-free, resistant to heat and cold, and polished inside and out in a chic Slate Grey. Other finishes also available online, or add your own paint to color match.

Supreme Fiberglass Planters have an impressive handle on moisture, from their easy-to-rinse exterior, to the custom drainage mat inside. A well-designed system for runoff moves water effortlessly through the convex base of the planter to eventually purge it through openings on the side. The mat also adds a layer between soil and the container bottom so air can circulate through roots. With optimal airflow and no root rot, you'll have the most impressive floral arrangements on the block.

Order fiberglass window boxes online in standard sizes or call to request custom lengths measuring up to 14-feet. Planters come with standard wall brackets and bolts; additional hardware for non-standard surfaces, railings and ledges sold separately.

72" 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