Karlliu 30" Window Box Planters (2-Pack) for Railings & Balconies — Adjustable Brackets, Felt Liners

Karlliu 30-inch window boxes are a two-pack of weather-resistant metal planters with felt liners and adjustable brackets for hanging on railings, fences, and windowsills.

These rectangular trough-style planters combine powder-coated carbon steel construction with breathable non-woven fabric liners to give outdoor flowers and herbs a neat, supported home. Each set includes two 30" long boxes designed to resist rust, reduce soil leakage, and adapt to a range of mounting situations so you can add layers of color to porches, balconies, decks, and garden railings.

How sturdy are these planters for outdoor use?

The baskets are built from carbon steel finished with a rust-resistant powder coating to stand up to seasons of outdoor exposure. Reinforced hardware at the base helps keep soil in place, while the metal frame resists bending under typical planting weight.

• Powder-coated carbon steel resists corrosion and fading.
• Reinforced bottom to limit soil loss and sagging.
• Holds typical potting mixes, herbs, annuals, and trailing plants.

Will these fit my railing or windowsill and how do the brackets work?

Each planter comes with adjustable brackets that offer multiple mounting positions so you can attach the box to different railing widths and window ledges. The brackets slide and lock into place for a secure fit without complicated hardware.

• Four installation options accommodate various rail and sill sizes.
• Brackets adjust, clamp, and lock for a snug fit on fences or rails.
• Tool-free assembly and bracket adjustment speeds installation.

How does the fabric liner affect plant health and maintenance?

The non-woven felt liner promotes aeration and retains moisture, helping roots breathe while preventing quick runoff. It also reduces soil escaping through the basket and simplifies seasonal planting and cleanout.

• Breathable fabric prevents root suffocation and overwatering.
• Good water retention reduces frequent watering needs.
• Removable liner makes replanting and cleaning easier.

What are the size and contents of the package?

This listing includes two identical 30-inch long trough planters sized to fit many balcony and deck applications. Each box measures 30" L x 7" W x 5.25" H and arrives with adjustable brackets and fabric liners ready for simple assembly.

• Two 30" long rectangular hanging planters per pack.
• Dimensions: 30" L x 7" W x 5.25" H per planter.
• Includes adjustable brackets, hardware, and felt liners.

Who is this for? Gardeners who want a tidy, long-lasting way to add continuous blooms or herbs across a balcony, deck railing, or window ledge will appreciate this set. It’s well suited to homeowners, renters with outdoor railings, balcony gardeners, and anyone looking for a low-fuss planting solution that balances durability, drainage, and easy installation.