Skip to content

Best Large Window Boxes of 2026

Toby Butcher Avatar
Toby Butcher

Last Updated:

Save
Share

* We independently evaluate all recommended products and services. If you click on links we provide, we may receive compensation.

Large window boxes are a practical and stylish addition to any home or garden. These boxes come in various materials such as wood, metal or plastic and can be used to grow a variety of plants, flowers or herbs. They are perfect for those who have limited outdoor space or want to add some greenery to their windowsills. With the right soil and plant selection, these boxes can thrive even in urban environments. Additionally, they can serve as a decorative element to enhance the overall aesthetic of your home.

At a Glance: Our Top Picks

RUDDINGS WOOD 48" Large Outdoor Window Box Cover #TOP 1

RUDDINGS WOOD 48" Large Outdoor Window Box

9.8
Read Review
RUDDINGS WOOD Large Metal Window Boxes Cover #TOP 2

RUDDINGS WOOD Large Metal Window Boxes

9.7
Read Review
LaLaGreen Self-Watering Planter Box Set Cover #TOP 3

LaLaGreen Self-Watering Planter Box Set

9.5
Read Review

Top 4 Large Window Boxes

#TOP 1 Best Outdoor Window Boxes

RUDDINGS WOOD 48" Large Outdoor Window Box

RUDDINGS WOOD 48" Large Outdoor Window Box Cover

RUDDINGS WOOD 48" (121cm) Large Metal Window Box - Garden Flower Basket Wall Trough - Outdoor Hanging Window Sill Planter Box

The RUDDINGS WOOD Window Box is a 48" (121cm) large garden planter that features a quality coco liner. This liner, made from natural coconut fibres, helps retain moisture after watering, ensuring your plants thrive. Constructed from heavy gauge flat steel with a black powder coating, it resists rusting and protects against various weather conditions. Additionally, it includes two fixing slots on the back for easy installation, allowing you to effortlessly enhance your outdoor space.

9.8
FTB Score
Buy on Amazon Find on eBay

What We Like

  • Large capacity for plants
  • Durable rust-resistant materials
  • Moisture-retaining coco liner
  • Easy installation with fixing slots
#TOP 2 Best Window Boxes for Flower

RUDDINGS WOOD Large Metal Window Boxes

RUDDINGS WOOD Large Metal Window Boxes Cover

RUDDINGS WOOD Set of 2 x 36" (91cm) Large Metal Window Boxes - Garden Flower Wall Baskets - Wall Trough - Outdoor Hanging Window Sill Planters

The RUDDINGS WOOD Window Boxes are a stylish solution for your outdoor planting needs. Each box measures 91cm wide, providing ample space for your flowers and plants. The heavy gauge steel construction with black powder coating ensures durability against rust and harsh weather, making them perfect for any garden setting. Included coco liners, made from natural coconut fibres, help retain moisture, so you can enjoy thriving plants with less frequent watering. Additionally, the two slots for easy fitting make installation a breeze, allowing you to beautify your space effortlessly.

9.7
FTB Score
Buy on Amazon Find on eBay

What We Like

  • Durable heavy gauge steel
  • Moisture-retaining coco liners
  • Easy installation with slots
  • Weather-resistant black coating
  • Ample planting space
#TOP 3 Best Self-Watering Window Boxes

LaLaGreen Self-Watering Planter Box Set

  • LáLáGreen
  • Black
LaLaGreen Self-Watering Planter Box Set Cover

LaLaGreen Planter Box for Indoor Plants (2 Pack, 16 Inch) Black Rectangular Self Watering Flower Pot, Large Window Boxes Planters with Drainage Decorative Modern Balcony Windowsill Herbs Home Garden

The LaLaGreen Planter Box offers a practical 2-pack set of 16-inch black window planter boxes, perfect for your indoor plants. Its self-watering system ensures your plants receive the right amount of moisture, making it ideal for busy individuals. Installation is a breeze, as it comes without hardware, allowing for versatile use in various settings. With a classic and minimalist design, these planters beautifully complement any decor while accommodating herbs, flowers, and small plants, enhancing your home or office space.

9.5
FTB Score
Buy on Amazon Find on eBay

What We Like

  • Self-watering feature for convenience
  • Easy to install and use
  • Minimalist design suits any decor
  • Perfect for herbs and flowers
#TOP 4 Best Metal Window Boxes

RUDDINGS WOOD 48" Fleur de Lys Wall Planter

RUDDINGS WOOD 48" Fleur de Lys Wall Planter Cover

RUDDINGS WOOD Large 48" (120cm) Fleur de lys Wall Trough Planter - Metal Window Box Garden Basket Planter

The RUDDINGS WOOD Wall Planter is a large 120cm (48") wide trough made from durable steel with a PVC coating, ensuring it can withstand various weather conditions. It comes with a quality coco liner, allowing you to easily plant and maintain your favourite flowers or herbs. The ornate Fleur-de-lys design adds an elegant touch to your garden or window. With its generous size, you can create a stunning display that enhances your outdoor space and brings joy to your gardening experience.

9.4
FTB Score
Buy on Amazon Find on eBay

What We Like

  • Durable steel construction
  • Includes quality coco liner
  • Elegant Fleur-de-lys design
  • Large size for ample planting
  • Weather-resistant materials

Frequently Asked Questions (FAQs)

1. What sizes do window boxes come in?

Since many windows are around three feet long, almost every window box style is available in 30″ and 36″ lengths. When placing a window box on a deck or porch railing, it should fill the space without making the railing unusable.

2. Should a window box be wider than the window?

For the best visual effect, your window box should be at least as wide as the window but should not extend more than three inches beyond the trim on each side.

3. What is the best depth for a window box?

A minimum of 8 inches in depth and 8 inches from front to back is required to have enough room for a selection of plants. Larger–say a foot in depth and width–is even better, particularly if you want to include a lot of plants and want them to fill out enough to overflow the box.

Editor's Notes

During our large window boxes research, we found 168 large window boxes products and shortlisted 4 quality products. We collected and analyzed 5,931 customer reviews through our big data system to write the large window boxes list. We found that most customers choose large window boxes with an average price of £30.13.

The large window boxes are available for purchase. We have researched hundreds of brands and picked the top brands of large window boxes, including RUDDINGS WOOD and more.

Written by

Toby Butcher Avatar

Toby Butcher

Toby Butcher is a Horticulturist, and he earned his title as a Master Gardener in 2016. Toby has acquired a 25-year experience as a home gardener planting, designing, grooming vegetables and flowers. He is the leader of a plant group in Durham. Toby owns a blog where he publishes articles on growing and growing your flowers at home, in a vase, or in a garden.