Karlliu 24" Window Box Planters 4-Pack — 24-inch Bronze Railing Planters with Adjustable Brackets & Coco Liners

These Karlliu 24-inch metal window boxes are a four-pack of adjustable, rust-resistant railing planters with coconut coir liners for easy, breathable outdoor planting.

Give fences, balconies, porches and windowsills a polished floral display with this set of four 24" Karlliu hanging planter boxes. Each trough-style planter is made from powder-coated carbon steel with a bronze brushed finish and includes a natural coconut fiber liner and an adjustable bracket system so you can mount them on different railing and sill widths. The design balances durability, drainage and airflow to support seasonal flowers, herbs and trailing plants while adding classic curb appeal.

How does the Karlliu planter handle weather and rust?

The planter body is constructed from carbon steel finished with a rust-resistant powder coat to withstand outdoor exposure. Reinforced hardware and powder coating help prevent corrosion and keep the bronze appearance longer under normal weather conditions.

• Powder-coated carbon steel resists rust and chipping.
• Bronze brush finish hides wear and complements outdoor decor.
• Reinforced brackets reduce stress at mounting points.
• Coco liner protects metal from direct moisture contact.

What mounting options and adjustments are available?

The included adjustable brackets offer four installation positions so the same planter can fit a variety of fence rails, windowsills and balustrades. Installation is tool-free and reversible, making it simple to reposition or move the planters as needed.

• Four adjustable bracket positions for different rail widths.
• Quick assembly — brackets clip on without tools.
• Can hang on railings, fences, pergolas, or sit on windowsills.
• Removable liners make plant swaps and seasonal care easier.

Will the coconut liner support healthy plants?

The set includes natural coconut coir liners that improve root aeration and retain moisture evenly, creating a breathable planting medium. The liners are shaped to reduce soil loss while allowing excess water to drain away, helping prevent root rot when used correctly.

• Coco coir offers balanced water retention and drainage.
• Natural fibers encourage air circulation to plant roots.
• Prevents soil escaping through the drainage system.
• Easy to remove for repotting or seasonal replacements.

How big are these planters and what plants fit best?

Each trough measures 24" long by 7" wide and 5.5" high, a size suited for mixed flower displays, trailing petunias, geraniums, herbs or compact vegetable starts. The elongated shape lets you combine several small plants for a fuller look without crowding roots excessively.

• Dimensions: 24" L x 7" W x 5.5" H per planter.
• Great for annuals, small perennials, herbs and succulents.
• Space allows layered plantings—tall background, trailing front.
• Four-pack provides consistent styling across a balcony or fence.

Who is this for: Homeowners, renters with balconies, and gardeners who want a neat, durable display without custom fabrication will appreciate this Karlliu 4-pack. It’s designed for people who need flexible mounting options, appreciate a classic bronze finish, and prefer natural liners for healthier potted planting. If you want a low-fuss way to add curb appeal and seasonal color to railings, windowsills or patios, this set offers a ready-to-install solution.