Best Extra Large Planters: What the Listed Sizes Really Hold

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Updated 20 October 2026 | Author: Ken

If you are looking for the best extra large planters, start with volume rather than the word large. A planter labelled large can hold a few quarts or several cubic feet, and the listings in this set do not always agree with their own figures. The 12 listings we read for this guide include oval galvanized beds, tall urns, a modular bed and a vertical stack, plus several items that are not planters at all. Four are used as cards. The rest are named at the end with the reason they were left out.

Quick answer

• Compare the volume in cubic feet, not the label. A 4 by 2 by 1 foot bed works out to 8 cubic feet of outer volume, but its listing gives 7.14 cubic feet.
• For the largest single bed in this set, look at the modular bed. Its listing gives 5 by 3 by 1 feet and 15 cubic feet, and those figures agree.
• For a tall planter for a porch, look at the urns. Each is 23.62 inches tall, but its planting depth is 6.69 inches.
• For six planting spaces in a small footprint, look at the vertical frame. It has six stackable planters, each listed at 16.7 by 6.9 inches.

What extra large means in these listings

The word large is used loosely. One urn listing says Size: Large, but gives no volume. Two beds give a size in feet, and one gives a size in centimetres for a stacked frame. The useful comparison is the outer volume worked out from the stated size, and then the figure the listing gives for soil or capacity. Where those two numbers are close, the listing is consistent. Where they are not, the listing needs a closer look.

The University of Maryland raised bed article says that raised beds can be custom-built or purchased as a kit to assemble. That split matters for large beds, because a large kit is more parts to fit together, and the listings describe the assembly in different ways. The Iowa State raised bed article says that higher beds are easier to work in but require more soil to fill them. A large bed is therefore a bigger job on two fronts: the soil you buy and the assembly you do.

Volume: a table of the stated figures

The table uses the stated sizes and capacities in each listing. Outer volume is length times width times height. It is larger than the soil a bed holds, because the walls and base take up room, and none of the listings states a wall thickness or a planting depth that would allow a closer calculation.

Listing	Stated size	Stated capacity or volume	Outer volume, worked out	What it tells you
Land Guard, oval galvanized, silver	4 x 2 x 1 ft per bed	7.14 cubic feet	4 x 2 x 1 = 8 cubic feet, or 8 times 7.48 = 59.84 gallons	The stated figure is 0.86 cubic feet below the outer volume
G GOOD GAIN, modular galvanized, green	5 x 3 x 1 ft (one piece)	15 cubic feet	5 x 3 x 1 = 15 cubic feet	The figures agree
seethmi, urn planters, set of two	19.69 x 15.75 x 23.62 in each	Not stated; planting depth 6.69 in	19.69 x 15.75 x 23.62 = 7,325 cubic inches, or about 4.24 cubic feet	Outer volume only; the soil volume is not stated
Luplom, vertical frame with six planters	16.7 x 6.9 in per planter	Not stated	16.7 x 6.9 = 115.2 square inches of footprint per planter	The planter footprint is stated; the depth is not

The Land Guard gap is the one to notice. A 4 by 2 by 1 foot bed is 8 cubic feet, or 8 times 7.48 = 59.84 gallons at 7.48 gallons per cubic foot. The listing gives 7.14 cubic feet, which is 0.86 cubic feet less. A gap that small may come from how the listing measures the inside, but the listing does not say. The Gartist bed, from another brand in the research pool, gives the same 7.14 cubic feet for the same 4 by 2 by 1 foot size. Two brands giving the same figure suggests a common convention for this size, but neither listing says how the figure is measured.

The G GOOD GAIN bed gives the clearest case. A 5 by 3 by 1 foot bed is 15 cubic feet, and the listing gives 15 cubic feet. The figures agree, and the bed has the largest outer volume of the four picks. That makes it the largest single bed in this set that is also internally consistent.

The seethmi urns are different. Each urn is 19.69 by 15.75 by 23.62 inches, which is about 4.24 cubic feet of outer volume. The listing gives a planting depth of 6.69 inches and an opening of 15.74 inches. So an urn is tall and wide, but its usable soil depth is shallow compared with its height. A tall urn can hold a shrub or a flowering plant, and the listing says it is spacious enough for tall shrubs and flowering plants. For root crops, the planting depth is the number to check.

The Luplom frame is measured by its planters. The listing gives 16.7 by 6.9 inches for each planter, which is 115.2 square inches of footprint, about 0.8 square feet. Six of them give six spaces that are each narrow. The listing does not state the depth of each planter, so it is not possible to work out the soil volume from the listing alone.

Planning the footprint from the stated sizes

Suppose you want the G GOOD GAIN bed and two of the 4 by 2 foot beds on one patio. The modular bed is 5 by 3 feet, which is 15 square feet of ground. Each 4 by 2 foot bed is 8 square feet. Together the three beds cover 15 plus 16 = 31 square feet, before you allow for walking room between them. Add a path at least as wide as you can reach across from either side, and check the total against the patio. This is arithmetic from the stated sizes, not a layout rule, and the listings do not say how close beds can sit to a wall or to each other.

Galvanized beds and what the sources cover

Galvanized steel beds are described in these listings as rust-resistant, weather-resistant and with an open base. The Land Guard listing describes Q195 galvanized metal with double-layer galvanizing and an oval shape, and its bullets say the open base helps avoid water build-up. The G GOOD GAIN listing describes thickened steel with a rust-resistant coating and wavy reinforced panels, and says its open-bottom design prevents waterlogging and root rot. These are listing claims. The sources we opened do not cover galvanized steel durability, and they do not say whether an open-bottom bed prevents root rot on its own.

The University of Maryland container page says all containers need adequate holes or slits to drain excess water, and that is a general point about containers. An open-bottom bed is not a container with a bottom, so the rule does not apply in the same way. The Iowa State raised bed article says that a properly prepared raised bed increases drainage, and that raised bed soil should be light and well drained. Those are the points the sources support.

The seethmi urns and the Luplom frame use HDPE and plastic. The seethmi listing describes HDPE that resists rot, rust and warping, and it describes drainage holes with a removable rubber plug. The sources we opened do not confirm those claims, so treat them as listing claims.

Drainage on a large bed

A large bed holds more soil, and more soil holds more water. The University of Maryland raised bed article says the looser texture of a raised bed lets the soil drain well, which reduces the risk of waterlogging and root rot. That applies to the bed as a whole, not to a single planter. The Iowa State potting media article says taller containers are generally easier to keep drained than shorter ones, and that shallow containers are often chosen for drainage but are not the best option when excellent drainage matters. That is the trade-off with the urns. The urns are tall, but the planting depth is shallow.

The Illinois Extension page says gravel in the bottom of a pot does not improve drainage, and that saucers that cannot be emptied are a problem. Those points carry over to the trays under the Luplom planters and to any tray under a large urn. Check that the trays slide out and empty, and do not add gravel for drainage.

Five checks before you buy

1. Work out the volume in cubic feet. Multiply length, width and height in feet, then compare the figure with the stated capacity.
2. Check the planting depth, not only the height. The seethmi urns are 23.62 inches tall, but the planting depth is 6.69 inches.
3. Measure the place. A 5 by 3 foot bed needs 15 square feet of ground, and a vertical frame needs a footprint near its stated size.
4. Plan the assembly. Most of these are kits or stacks. The listings describe the parts and the assembly differently, so read the instructions for the one you choose.
5. Plan the drainage. Check each hole, each open base and each tray.

Mistakes to avoid

• Buying by the label. A large label does not tell you the soil volume. Work it out from the stated size.
• Using an urn for root crops. The seethmi planting depth is 6.69 inches, and the listing says the urns suit tall shrubs and flowering plants.
• Trusting one figure. The Land Guard figure is 0.86 cubic feet below the outer volume, and the listing does not explain it.
• Planning soil for a lamp post. Three of the listings are solar lamp posts with a planter base, and the planter is small. They are not extra large planters.
• Adding gravel to the bottom. The Illinois page says gravel does not improve drainage.

Listings without a card: Three solar lamp posts with a planter base, from Derynome, LEOKED and Yonaveil. Each is a light fixture with a small planter, and the planter is not large enough to count as an extra large planter. The lamp posts are the subject of a separate planned guide, so they are not carded here. The Akeydeco 48-inch shepherd’s hook, which is a bird feeder pole that can hang a planter, so it is a hanger, not a planter. The ERYTLLY bird feeding station, a pole with hooks and trays for feeders, so it is not a planter. The natural wheat straw mulch, a 4-pound compressed bale used as mulch and decor, not a planter. The second Land Guard bed, in brown, which is the same 4 by 2 by 1 foot size as the silver one carded here. The Usocik 10-inch urn planters, a two-pack of planters that are not large by any measure in the listing, so they do not match the question.

How we chose

We read the title, the bullets and the stated specifications for all 12 listings in the research pool, which was checked on 20 October 2026. The criteria were that the product had to be a planter someone can buy and fill with soil, that the listing had to state a size in a unit that can be converted to volume, and that the listing had to give enough figures to compare against the others.

Four listings became cards: a galvanized bed, a modular bed, a pair of urns and a vertical frame. Each card has a reason from its own listing: the stated volume, the modular design, the planting depth or the planter footprint. Eight listings were not used. Three are solar lamp posts with a planter base, two are hangers or feeders, one is mulch, one is a duplicate colour of a carded bed, and one is a 10-inch urn that does not match the question of an extra large planter.

We did not use any sales or feedback signal. The order of the cards follows the research pool, not a ranking.

What we could not verify

• Soil volume for the urns and the vertical frame. The listings give outer sizes and, for the urns, a planting depth, but no soil volume.
• The gap in the Land Guard figure. The listing gives 7.14 cubic feet for a size that works out to 8 cubic feet. We could not explain the gap.
• Durability of galvanized steel, HDPE and plastic. The sources we opened do not confirm the rust, UV, weather or warping claims in the listings.
• Whether an open base prevents root rot on its own. The sources we opened do not say so, and this guide does not claim it.
• Load limits for large beds. None of the listings gives a weight limit for a full bed, and none of the sources we opened gives one.

FAQ

What counts as an extra large planter?

The label does not settle it. Use the stated size to work out the outer volume in cubic feet, and then check the soil volume or planting depth the listing gives. The G GOOD GAIN bed, at 15 cubic feet, is the largest bed in this set with figures that agree.

How much soil does an extra large planter hold?

Use the stated volume where the listing gives one, and work it out from the size where it does not. The Land Guard bed gives 7.14 cubic feet for a size that works out to 8 cubic feet. The urns give a planting depth of 6.69 inches, and the Luplom frame gives 16.7 by 6.9 inches per planter.

Do extra large planters need drainage holes?

Yes, according to the University of Maryland container page, which says all containers need adequate holes or slits so excess water can drain. A raised bed with an open base has a different drainage path, but the University of Maryland raised bed article still describes the soil in a raised bed as draining well when it is properly prepared.

Can I use an urn for a vegetable?

The seethmi listing says its urns are spacious enough for tall shrubs, flowering plants or greenery, and it gives a planting depth of 6.69 inches. For a root crop, the depth is the figure to check, and the sources we opened do not cover urns for vegetables.

Are solar lamp posts with planters extra large planters?

No. Each one is a light fixture with a small planter base, and the planter is not large enough to hold the soil a bed or an urn holds. The lamp posts are excluded from the picks in this guide.

Bottom line

For an extra large planter, decide on the volume first: work out the outer volume from the stated size, then check the soil depth or capacity the listing gives. Choose the modular bed when you need the most volume with consistent figures, an urn when height matters more than depth, and the vertical frame when you need several spaces in a small footprint. Where the figures do not agree, ask the seller before you plan the soil.

If you are deciding between a bed and a container for the same plants, read our guide to how much soil a raised bed garden needs. For the planting side, see companion planting for a raised bed garden layout.

Sources

• University of Maryland Extension, “Growing Vegetables in Raised Beds” (updated March 26, 2026), opened 2026-10-20. https://extension.umd.edu/resource/growing-vegetables-raised-beds
• Iowa State University Extension and Outreach, “Creating Raised Bed Planters”, opened 2026-10-20. https://yardandgarden.extension.iastate.edu/how-to/creating-raised-bed-planters
• Iowa State University Extension and Outreach, “Potting Media: Components and Handling” (March 2025), opened 2026-10-20. https://yardandgarden.extension.iastate.edu/article/2025/03/potting-media-components-and-handling
• University of Maryland Extension, “Growing Vegetables in Containers and Salad Tables”, opened 2026-10-20. https://extension.umd.edu/resource/growing-vegetables-containers-and-salad-tables
• Illinois Extension, “Container Drainage Options” (Container Gardens), opened 2026-10-20. https://extension.illinois.edu/container-gardens/container-drainage-options