Best Rectangular Window Boxes of 2025

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Rectangular window boxes are a popular gardening accessory that allows you to add greenery and beauty to your outdoor space. These boxes are typically made of wood or plastic and come in a range of sizes, allowing you to choose the perfect fit for your windowsill or balcony railing. With the right soil, seeds, and care, you can grow herbs, flowers, and even vegetables in these boxes, adding a touch of nature to your home. These versatile window boxes are an excellent choice for anyone looking to add some flair to their outdoor space without taking up too much room.
At a Glance: Our Top Picks
Top 10 Rectangular Window Boxes
RUDDINGS WOOD Large Metal Window Boxes
The RUDDINGS WOOD Window Boxes are perfect for enhancing your outdoor space. Made from heavy-duty solid steel, these sturdy flower troughs are designed to withstand the elements. Their stylish front twisted bars add an attractive decorative touch, making them ideal for hanging under windows or on garden walls. With two hanging hooks included, you can easily fit them to walls or garden fences. Plus, the black powder coating protects against rust and discolouration, ensuring they remain looking good for years to come.
KADAX 18 x 56 cm Outdoor Planter
The KADAX Outdoor Planter is an excellent choice for enhancing your balcony or windowsill. Its functional design not only complements modern aesthetics but also protects your plants, ensuring they thrive. The clever removable insert improves drainage and aeration, which is crucial for preventing overwatering and promoting healthy root growth. With its weatherproof features, this planter withstands UV rays and frost, maintaining its beauty through various seasons. Made from durable plastic, it resists scratches and deformation, giving you peace of mind for long-lasting use.
LEXININ 6 Pack Black Window Planters
The LEXININ Window Planters are versatile and stylish options for your home. With dimensions of 35 x 17 x 14cm, the ample size allows you to grow multiple plants simultaneously, enhancing your living space. Made from durable resinous material, these planters are designed to withstand outdoor conditions without cracking. The built-in drainage system, featuring holes in the pot and a tray to catch excess water, prevents overwatering, ensuring your plants thrive in a healthy environment. Use them in any setting, from window sills to balconies, to create a touch of nature indoors.
Pingeui 6 Pack Plastic Window Box Planter
The Pingeui Window Box Planter offers ample space for growing multiple plants simultaneously, making it perfect for succulent enthusiasts. Its high-quality plastic construction ensures durability and ease of maintenance, so you won’t have to worry about rust or heavy lifting. With small drainage holes and raised feet, it promotes healthy plant growth by preventing water accumulation. Additionally, each planter comes with trays to catch excess water and labels to help you keep track of your plants, making gardening more organised and enjoyable.
GROWNEER 3 Packs White Flower Boxes
The GROWNEER Flower Boxes are a versatile option for your gardening needs. Each pack includes three planters and 15 plant labels, making it easy for you to identify your plants. The perfect size allows you to grow a variety of indoor and outdoor plants, including flowers and vegetables. Made from high-quality, eco-friendly plastic, these planters are durable and can be reused season after season. The unique bottom design ensures proper airflow and drainage, promoting healthy plant growth.
ZOENHOU 6 Pack Flower Window Box Planter
The ZOENHOU Window Box Planter is crafted from sturdy PP material, ensuring durability while being lightweight for easy movement. With predrilled holes, it offers excellent drainage, keeping your plants healthy and well-watered. The package includes six vibrant planters and 30 green labels, allowing you to add a splash of colour to your garden or patio. Once filled with soil and flowers, these rectangular planters provide stability on outdoor shelves, making them perfect for a variety of plants.
Arthur Cameron Rectangular Lined Wicker Planter
The Arthur Cameron Wicker Planter is a stylish and practical addition to any home. Its full wicker weave not only enhances its aesthetic appeal but also provides durability. The plastic lining ensures that your plants stay hydrated without damaging the wicker, making it perfect for indoor use. Available in various sizes, you can choose the one that best fits your space, whether it’s for a window box or a decorative indoor planter.
HOXHA 6-Pack Indoor and Outdoor Planters
The HOXHA Window Box Planters are constructed from durable plastic, ensuring they can withstand multiple gardening seasons. Their versatile design makes them perfect for indoor and outdoor use, allowing you to enhance your windowsills, patios, or balconies. With dimensions of 17 inches long, these planters provide ample space for your plants to thrive. Additionally, the complete set includes trays, a plant spray bottle, plant labels, and mini garden tools, making your gardening experience more convenient and enjoyable.
ZOENHOU 6 Pack 43cm Flower Window Box Planter
The ZOENHOU Window Box Planter is constructed from high-quality PP material, ensuring durability and resistance to cracking, making it suitable for both indoor and outdoor use. Its lightweight design allows you to easily reposition it as needed. Each planter features predrilled holes for drainage, ensuring your plants receive proper airflow and moisture, promoting healthy growth. Additionally, the included trays help maintain water levels during warm, dry spells, providing convenience for plant care.
LEXININ 6 PCS Grey Rectangular Planters
The LEXININ Rectangular Planters are ideal for adding a touch of nature to your home. With dimensions of 35 x 17 x 14cm, these plastic planters are lightweight yet durable, making them easy to handle while ensuring they last. The integrated drainage system prevents overwatering, protecting your plants and keeping your space tidy. Plus, their versatility allows you to display flowers or succulents in various settings, from your windowsill to your porch, enhancing any environment with elegance.
Frequently Asked Questions (FAQs)
1. 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.
2. 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.
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.
4. What are flower boxes under windows called?
A window box (sometimes called a window flower box or window box planter) is a type of flower container for live flowers or plants in the form of a box attached on or just below the sill of a window.
During our rectangular window boxes research, we found 185 rectangular window boxes products and shortlisted 10 quality products. We collected and analyzed 14,279 customer reviews through our big data system to write the rectangular window boxes list. We found that most customers choose rectangular window boxes with an average price of £20.15.
The rectangular window boxes are available for purchase. We have researched hundreds of brands and picked the top brands of rectangular window boxes, including RUDDINGS WOOD, KADAX, LEXININ, PINGEUI, GROWNEER. The seller of top 1 product has received honest feedback from 550 consumers with an average rating of 4.8.

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.