Best Square Planter Inserts For Large Pots

#1 · Best Overall

1. Bloem Ups-A-Daisy 13-inch 2-Pack

• Dimensions D x W x H: 13"D x 13"W x 1"H
• Size: 13" Width x 1" Thick

Best for: For two 13-inch square pots.

Why it ranks #1: Its two 13-inch resin platforms have drainage holes and are described as soil-saving inserts, combining a useful large-pot size with clear care and durability details.

Bloem’s two-pack of 13-inch resin inserts combines drainage holes with a shelf-like soil-saving platform, helping gardeners reduce fill while providing airflow for roots. The stated 13-by-13-inch size gives the set a clear target for larger square planters, and its durable, UV-protected resin supports straightforward care.

Each insert measures 13 inches square and one inch thick, giving buyers a defined platform size for checking a planter’s interior. Bloem advises measuring inside width 1/2 to 2/3 of the way down, a useful step because planter walls can taper. Drainage holes provide airflow for root growth, while the shelf function reduces excess soil. Fade-resistant resin is described as maintenance-free and easy to clean, and the two-pack prepares two pots.

Skip it if you need a 12-inch platform for a 14- to 16-inch pot; Conderyang lists that size and pot range.

This two-pack suits buyers with two large square planters who want a resin shelf, drainage holes, and reduced soil filling. Measure inside width 1/2 to 2/3 down the pot, as Bloem recommends, before selecting the 13-inch size.

Listed on Amazon as: Bloem Ups-A-Daisy Square Planter Insert – 13" Width x 1" Thick, 2-Pack

#2 · Best Drainage

2. LFUTARI 13-inch 2-Pack

• Dimensions D x W x H: 13"D x 13"W x 1"H
• Size: 13" x 13"

Best for: For reusable 13-inch planters.

Why it ranks #2: This reusable 13-by-13-inch pair includes liners and trays, and its enlarged drainage holes are specified to remove excess water.

Enlarged drainage holes are the defining feature of LFUTARI’s two 13-inch inserts, helping excess water escape while the trays reduce the soil needed in large pots. The included non-woven fabric liner adds a separate lining component, making this set useful for gardeners managing both soil volume and drainage in square containers.

The 13-by-13-inch trays are made from PP plastic and supplied with non-woven fabric liners, combining a reusable rigid insert with a lining component. Enlarged drainage holes are specified to remove excess water, supporting a less waterlogged root area. By reducing soil volume, the inserts can also make large pots easier to handle. The two-tray pack supports two setups, but the stated square size is the main fit boundary for choosing containers.

Skip it if you need a 12-inch insert for a 14- to 16-inch pot; Conderyang specifies that pot range for its square set.

LFUTARI suits gardeners preparing two 13-inch square containers who want reduced soil volume, drainage holes, and fabric liners. Check the planter’s usable interior dimensions against the stated tray size before choosing this set.

Listed on Amazon as: 2Pack 13" Square Planter Insert-Reusable Large Plant Pots Insert with Liner

#3 · Best Fit Range

3. Conderyang 12-inch 2-Pack

• Dimensions D x W x H: 12.01"D x 12.01"W x 0.39"H
• Size: 12inch
• Material: Plastic

Best for: For lighter large square pots.

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Why it ranks #3: The two 12-inch plastic inserts are specifically stated to fit 14- to 16-inch pots, a useful compatibility detail for large planters.

The two-piece set of 12-inch square inserts is sized for 14- to 16-inch pots, giving gardeners a way to reduce the amount of soil inside larger containers. Their plastic construction and bright orange color suit practical garden setups where a lighter, easier-to-move pot and a visible insert are useful.

Each insert measures about 12 inches square and is specified for 14- to 16-inch pots, so the set targets larger containers rather than small tabletop planters. The soil-saving design reduces the amount of growing mix needed and lowers overall container weight, which can make pots easier to move. Plastic construction supports reuse, while the two-piece quantity lets you prepare two pots. The listing identifies the inserts as liners, but provides no drainage-hole specification.

Skip it if you need stated drainage holes; Furniok's 11-inch square insert lists a drainage hole.

Choose this set if you have two 14- to 16-inch square pots and want to reduce soil volume and lifting weight. Its 12-inch size is the key boundary, so it is not the listed choice for smaller containers.

Listed on Amazon as: 2 Pcs 12" Square Planter Insert, Fits 14"-16" Pot

#4

4. Bloem Ups-A-Daisy 12-inch

• Dimensions D x W x H: 12"D x 12"W x 0.75"H
• Size: 12 Inch (Pack of 1)
• Material: Plastic

Best for: For easy-clean tapered planters.

Why it ranks #4: This 12-inch plastic platform has pre-drilled drainage and is described as reducing soil and weight by up to 50 percent.

Pre-drilled drainage holes and durable resin give Bloem’s single square insert a practical combination for large tapered pots: it reduces the soil needed while allowing pass-through watering. Its 11.75-inch width is specifically identified, helping buyers narrow the fit for a planter with a suitable interior opening.

The 11.75-inch square platform is 0.75 inch thick, and its shelf-like placement helps reduce the soil required in large tapered pots. Pre-drilled holes support pass-through watering, so water can move through the insert rather than being held above it. Resin construction is described as maintenance-free, easy to clean, and UV-protected for fade resistance, a useful combination for routine care. The package contains one insert, making it a single-pot option.

Skip it if you need a two-pack of 13-inch inserts; Bloem Ups-A-Daisy 13-inch is supplied as a two-pack.

This Bloem insert fits buyers filling a large tapered pot who want pass-through watering and an easy-clean resin platform. Its single-unit pack and 11.75-inch width are important considerations when outfitting multiple or larger planters.

Listed on Amazon as: Bloem Ups-A-Daisy Square Planter Insert – 11.75" Width x 0.75" Thick

#5

5. Furniok 11-inch Insert

• Dimensions D x W x H: 1"D x 1"W x 1"H
• Size: 11 inch

Best for: For drainage in 11-inch pots.

Why it ranks #5: The 11-inch square insert is a direct platform-style option with a listed drainage hole, though the supplied dimensions do not clarify its actual fit range.

A listed drainage hole distinguishes Furniok’s two-pack of 11-inch square inserts, giving buyers a stated water-exit feature alongside a soil-saving insert format. The orange inserts are presented for large pots, making the set a straightforward option when you need a pair of square risers with drainage specified.

The 11-inch size gives this two-pack a defined scale for square planters, while the listed drainage hole provides a route for excess water to leave the insert area. That combination can help buyers plan both container size and watering workflow before filling a pot. Orange coloring makes the pieces visible during setup. The supplied specifications do not describe the material, exact dimensions, or an included liner, so those details should not be assumed.

Skip it if you need verified material or precise dimensions; Bloem Ups-A-Daisy 12-inch lists both size and plastic construction.

Consider Furniok when you need two 11-inch square inserts and want a stated drainage hole. The supplied listing leaves material and exact dimensions unspecified, so it suits buyers whose main requirements are pack count, nominal size, and drainage.

Listed on Amazon as: 2-Pack Square Planter Insert for Large Pots, 11 Inch

#6 · Largest Listed Liner

6. Syyavrrta Square Coir Liner

• Dimensions D x W x H: 12.01"D x 12.01"W x 0.79"H
• Size: 13.98 x 13.98 x 0.79 in
• Material: Wood

Best for: For square balcony boxes.

Why it ranks #6: Its listed size is 13.98 by 13.98 inches, and the natural coir liner is shaped for square planters and allows excess water to drain.

The square coconut coir form targets rigid balcony boxes and rectangular planters, helping cover corners that a round liner may leave bunched or open. Its breathable natural fiber holds soil while permitting excess water to drain, giving gardeners a shaped liner option for angular containers rather than a rigid insert shelf.

Syyavrrta’s pre-formed square coir liner is described for square balcony boxes and modern rectangular pots, where its corners can sit more neatly than a round liner. The natural coconut fiber contains soil while allowing excess water to drain through its breathable structure. The listing gives a 13.98-inch square size and 0.79-inch thickness in its size specification, though another dimension field differs; check the stated size against the container before ordering.

Skip it if you need a clearly consistent 12-inch liner specification; Generic's square coir liner lists dimensions of 12.01 inches square.

This liner suits gardeners fitting a breathable coir insert into an angular balcony box or rectangular pot. The listing’s size fields are not fully consistent, so verify the container dimensions against the stated 13.98-inch size.

Listed on Amazon as: Square Coconut Coir Planter Liner, Natural Fiber Insert for Geometric Pots and Balcony Boxes

#7

7. Generic Square Coir Liner

• Size: 13.98 x 13.98 x 0.79 in
• Material: Wood

Best for: For square balcony-box lining.

Why it ranks #7: The nearly 14-inch square coir liner holds soil while allowing drainage, but it lines a planter rather than creating a soil-saving shelf.

A pre-formed square coconut coir shape addresses the corner gaps and bunching that can occur when round liners go into geometric balcony boxes. The natural fiber holds soil while allowing excess water to drain, making this one-piece liner a soil-containment choice rather than a rigid volume-reducing platform.

The listed size is 13.98 by 13.98 inches with a 0.79-inch thickness, and the pre-formed square shape is intended for square planters and rectangular balcony boxes. Coconut husk fiber creates a breathable barrier that helps retain potting soil while permitting drainage. That combination supports use as a liner in angular containers, where round material may leave empty corners. The listing specifies one piece, so it is suited to a single replacement or planter setup.

Skip it if you need liners for many 14-inch pots; Panacea Planter Coco Liner is listed as a 24-pack.

Choose this liner for one square or rectangular planter where coir soil containment and drainage matter more than a rigid raised shelf. Its nearly 14-inch listed size makes container measurement an important fit consideration.

Listed on Amazon as: Square Coconut Coir Planter Liner, Natural Fiber Insert for Geometric Pots and Balcony Boxes (1 PC)

#8

8. Generic 12-inch Coir Liner

• Dimensions D x W x H: 12.01"D x 12.01"W x 0.79"H
• Size: 12.01 x 12.01 x 0.79 in
• Material: Wood

Best for: For square pots using coir.

Why it ranks #8: Its 12.01-inch square natural-fiber shape suits geometric pots and drains freely, but it is a soil-holding liner, not a raised platform.

A precision-cut square shape helps this coconut coir liner fill the corners of geometric planters, where round liners can bunch or leave gaps. Its porous natural fiber holds potting mix while letting excess water drain, making it a fit for gardeners who want a breathable liner rather than a rigid soil-saving shelf.

The pre-formed liner measures about 12 inches square and 0.79 inch thick, giving buyers dimensions to compare with a rigid square container. Coconut husk fiber forms a breathable barrier that holds potting mix while allowing excess water to pass through. Its angular shape is intended to reduce corner gaps and bunching associated with round liners. This is a liner for containing soil, not a listed plastic platform that reduces the volume beneath a planting surface.

Skip it if you want a rigid shelf that reduces soil volume; Bloem Ups-A-Daisy 13-inch is a resin insert with drainage holes.

Choose this coir liner for a square geometric container when corner coverage and breathable soil containment matter more than raising the planting surface. Its roughly 12-inch square dimensions should guide the container fit decision.

Listed on Amazon as: Square Coconut Coir Planter Liner, Natural Fiber Insert for Geometric Pots

#9

9. Panacea 14-inch Coco Liner

• Size: 14-In.

Best for: For multiple 14-inch planters.

Why it ranks #9: The 14-inch square liner comes in a pack of 24, but the supplied details do not describe a soil-saving platform or drainage specifications.

A 24-pack of 14-inch square coco replacement liners makes Panacea the group’s bulk option for gardeners refreshing many matching containers. The listing identifies these as square liners, so they address soil containment in geometric pots rather than creating a rigid raised shelf to reduce the planting volume.

Each liner is listed at 14 inches and described as square, giving the pack a useful nominal size for matching a collection of planters. The pack of 24 supports multiple replacements or coordinated planting projects without buying individual liners one at a time. Coco material is identified in the product name, while supplied details do not specify thickness, drainage rate, or a rigid support structure. Treat it as a replacement liner, not a shelf insert.

Skip it if you need a rigid platform to reduce soil volume; Bloem Ups-A-Daisy 13-inch uses resin and includes drainage holes.

Panacea fits gardeners replacing liners across a group of 14-inch square planters who need a multi-piece pack. It is a coco liner rather than a rigid soil-saving insert, so choose it for lining, not raising the soil surface.

Listed on Amazon as: Planter Coco Liner, Square, 14-In.

#10

10. HolyMaji Adjustable Riser

• Size: 9.8"

Best for: For tall pots without loose fill.

Why it ranks #10: This chain-mounted riser is listed for planters up to 9.8 inches square, making it less suited to the large-pot use case than the larger inserts.

Eight chain hooks and an adjustable riser create a suspended planting platform for square tall pots up to 9.8 inches, avoiding the need to fill the container with heavy soil or pebbles. The two-set kit also includes drip trays, offering a different approach from flat soil-saving inserts.

The adjustable black risers use chains and hooks to hold small potted plants inside a square tall planter, with the listed fit extending up to 9.8 inches. This soil-free mounting approach avoids filling the surrounding space with heavy soil, pebbles, or plastic bottles. Two risers and eight chains and hooks are supplied, along with trays, and assembly is described as requiring no extra tools. The setup suits nested pots rather than direct planting into a soil shelf.

Skip it if you want to plant directly into a flat soil shelf; Bloem Ups-A-Daisy 13-inch provides a resin insert with drainage holes.

Choose HolyMaji if you want to suspend small potted plants inside square tall containers and avoid filling the space with loose material. The 9.8-inch maximum and nested-pot method define its fit and use.

Listed on Amazon as: 2 Sets Adjustable Planter Inserts for Large Pots, Square Planter Insert with 8 Chain Hooks, Plant Riser Fits up to 9.8" Square Tall Planters Pot & Free 8 inch Plant Saucer Drip Trays (Black)