Poly-Pro Flower Box / Liner

$9.00 - $18.00
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$9.00 - $18.00
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Planter Box Liner Features:

  • Use as a standalone flower box or as a liner inside planters
  • Ridged, scalloped sides provide sturdiness and durability
  • Constructed with high-grade, durable plastic
  • Lightweight, UV-resistant, and shatter-resistant
  • Built-in feet and drill-out holes for drainage
  • BPA-free and recyclable
  • Proudly made in the USA
  • Compatible with our Countryside Flower Box Trays
white flowers planted in a 36 inch green poly-pro flower box liner


Constructed with premium quality, long-lasting plastic, these liners are built to withstand the harshest environmental conditions. They are UV-resistant, preventing fading caused by prolonged sun exposure. They're also shatter-resistant, ensuring they stay intact even in adverse weather conditions.


  • 18" = 17½" L x 8" W x 5" H (view)
  • 24" = 23½" L x 8" W x 5" H (view)
  • 30" = 29¾" L x 8" W x 5" H (view)
  • 36" = 35¾" L x 8" W x 5" H (view)

Why Use Planter Box Liners

Flower window boxes add curb appeal to your home. And for some, they allow you to enjoy flowers and plants with limited planting space.

Unfortunately, they can deteriorate from the moisture conditions inside the planter—for example, metal flower boxes rust.

Wood flower window boxes rot. The beneficial organisms in the soil break down the wood and increase its decay rate. So, you may have to replace them every year.

But planter box liners let you can say goodbye to the frustration of deteriorating flower boxes. They provide a protective barrier, keeping your planters dry and extending their lifespan significantly.

The liners help extend the life of your planters by preventing direct contact with the soil, organic materials, and water inside your flower window box. Your planter box stays dry regardless of how often you water.

Flower Box Liners Make Planting Easier

Planter box liners let you pot your plants outside of the planter box. So you can move plants around easier. And you don't have to worry about your potting mix falling out of the flower window box and making a mess as you move pots around.

Just insert the flower box liner into your planter when you finish planting. The liners also make moving your plants from one location to another simple.

They also make it easy to plan. For example, rotating plants as the seasons change become less messy. All you have to do with liners is lift them up and transfer them to a different box.

You can also pre-plant new blooms so they are ready to be placed in your window when the right time of year rolls around. Or switch plants seasonally. For example, keep your bulbs inside the planter box liner after spring and use another liner to change to summer blooms.

Plastic Liners Prevent Leaching

Poly-Pro flower box liners are constructed from a superior plastic blend. And because plastic isn't permeable, you won't have to worry about moisture leaching into your planter.

For example, metal planters are prone to rust with water. Unfortunately, that rust may cause soil toxicity due to the release of chemicals, such as iron, which can cause stunted plant growth and yellow leaves.

Equally important, plastic prevents any chemicals in treated wood planter boxes from harming your plants. That's especially important if you use your window flower boxes to grow herbs or vegetables.

Used Planter Box Liners as a Standalone Flower Box

Our planter box Liners are ingeniously crafted to serve multiple purposes. You can use them as standalone flower boxes, creating beautiful arrangements even in limited planting spaces.

Alternatively, they can be used as liners inside existing planters, safeguarding them from moisture, soil contact, and organic materials.

Our planter box liners feature distinctive ridged panels to ensure ruggedness and sustainability. They also include convenient drill-out holes if you use them as a planter.

Their built-in feet provide proper airflow and reduce the chance of water pooling under the planter.

Pick Your Size and Color

Available in three appealing colors, our liners are 18", 24", 30", and 36". Whether you have a petite windowsill or a spacious garden, we have the perfect liner to fit your planter.

Our planter box liners are lightweight and recyclable. They're also UV-protected to resist fading. And they're proudly made in the USA.

Whether you're an avid gardener or a beginner, these liners are ideal for safeguarding your flower boxes and adding charm to your living spaces. Invest in the best – invest in our planter box liners today.


How should I pot my plant?

Add a small amount of perlite medium on the bottom of the flower box. Finish filling with a light to medium weight potting mix. Routinely adding plant food, according to plant’s directions, will dramatically increase the health, beauty and longevity of the plants in your Poly-Pro Flower Boxes.

What is the Poly-Pro Flower Box made of?

The Poly-Pro Flower Box is constructed from high-grade, durable plastic.

Is the Poly-Pro Flower Box self-watering?

No, only our Artstone resin planters contain a self-watering feature.

Does the Poly-Pro Flower Box have drainage holes?

Yes, but they need to be punched or drilled out to allow water to drain properly when using outdoors.

How much does the Poly-Pro Flower Box weigh?

The weight varies by size as follows:

  • 18-Inch: 0.7 lbs.
  • 24-Inch: 0.9 lbs.
  • 30-Inch: 1.2 lbs.
  • 36-Inch: 1.45 lbs.

Where is the Poly-Pro Flower Box manufactured?

The Poly-Pro Flower Box is proudly manufactured in the USA at our Lancaster, PA facility.

Do you ship outside the United States?

We ship internationally to Canada only. We recommend using a freight forwarding service, such as DHL, if you wish to order and ship outside of the U.S. or Canada. All shipments from our facility must be sent to a U.S.- or Canadian-based address.


Order Total Shipping Charge




Free Shipping*

*Flat rate and free shipping only apply within the Contiguous United States. All shipments outside the lower 48 states will be charged a shipping fee.

PO Boxes - We allow shipping to a PO box; however, please note that our flat rate & free shipping discounts will no longer apply. This is due to extra shipping charges we incur.

When will I receive my order?
Use the calculator at the top of this page or during checkout to find your estimated delivery date. Orders are typically processed and shipped in 1 business day via FedEx Home Delivery or USPS. You can also view this map from FedEx to estimate how long a shipment will take to arrive after it leaves our warehouse. We do not currently offer expedited shipping.

For more info, review our Shipping Policy and Return Policy in their entirety.