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Concrete planters are the default for permanent public realm planting, and not by accident. Nothing else matches the combination of weight, weather resistance, and expected lifespan that concrete delivers. But specifying concrete planters for a town centre, park, or public space is not the same as ordering garden pots: get the shape, capacity, or finish wrong, and you're looking at a maintenance problem that will outlast most management contracts. This guide covers the key decisions, from material properties through to shape selection and supplier criteria.
Quick answer: specify concrete planters by working through shape, then capacity, then finish. Rectangular for frontages and linear runs; square for entrance courts; hexagonal for pedestrianised zones; triangular and corner for irregular sites; large-format Andromeda for tree planting and landmark schemes. Confirm internal drainage, reinforcement type, loaded weight relative to site access, and powder-coat or exposed aggregate finish. Broxap manufactures precast concrete planters in all six shapes at UK facilities, with bespoke sizing available.
What is a concrete planter?
In a commercial context, a concrete planter is a precast or reinforced concrete vessel designed for permanent outdoor planting in public and high-traffic environments. That distinguishes it from domestic concrete pots, which are lighter, often unreinforced, and built to a different standard of durability.
Precast concrete planters and reinforced concrete planters are the terms you'll see most often in procurement documentation, and they refer to the same product category. Outdoor cement planters is a common search term for the same thing, though technically concrete and cement are different materials: the concrete planter contains cement as one ingredient rather than being made from cement alone.
The people specifying them tend to be council procurement officers putting together a public realm improvement package, landscape architects drawing up a planting scheme for a new development, BID managers commissioning street furniture for a managed town centre, or facilities managers replacing an existing installation on a campus or commercial estate.
Why is concrete the default material for permanent public planting?
Start with the weight. A large concrete planter loaded with soil and planting can sit at 500kg or more, which makes it effectively theft-proof and gives it a passive hostile vehicle mitigation (HVM) function that no other planter material achieves without mechanical fixing. That's the same logic behind concrete bollards in pedestrianised zones, and it's increasingly relevant to specifiers working on public realm schemes with a security brief alongside the greening requirement.
Concrete doesn't rust, rot, or degrade under UV. A coastal esplanade and an inland market square place very different demands on a planter, and concrete handles both without the corrosion risk that affects powder-coated steel or the surface deterioration that affects timber. Freeze-thaw cycling is less of a concern too, provided the mix specification is right. And on lifespan, concrete is in a category of its own: a well-specified planter can last 25 to 50 years or more with no treatment requirement beyond occasional cleaning. No other planter material comes close on whole-life cost once you factor in the maintenance that timber, steel, and plastic all require at different points in their lives.
There's also an aesthetic case. Concrete reads as a permanent, civic-grade material in a way that lighter alternatives do not, and the finish options available (smooth, exposed aggregate, acid-etched, polished) give designers enough variation to suit a contemporary public square or a more traditional setting without the material looking out of place in either.
When is concrete not the right planter material?
Concrete is not always the right answer. Three alternatives are worth comparing before the specification is settled.
Concrete vs steel planters. Steel is the obvious alternative when the layout needs to stay flexible. It's lighter and relocatable, which matters on schemes where the planting arrangement is likely to change over time or where a temporary installation is part of the brief. Powder-coated finishes also give steel planters a colour flexibility that concrete can't match, which is useful for BID-managed schemes with a specific palette. The trade-off is ongoing maintenance: steel needs periodic corrosion checks, particularly in coastal or high-pollution environments, and a chipped or faded powder coat needs attention before it becomes a rust problem. For permanent installations in low-maintenance environments, concrete generally wins.
Timber planters bring a warmth to parks and heritage settings that concrete cannot match, but the maintenance requirement is real. Timber planters need periodic treatment to remain in good condition, and in high-traffic public environments the appearance can deteriorate faster than the maintenance schedule allows. Lifespan is considerably shorter than concrete. For schemes where the planting sits within a natural or heritage context and the budget includes ongoing maintenance, timber is a genuine option. For low-maintenance permanent installations, it usually is not.
Recycled plastic planters are the right call on schemes where sustainability scoring is a procurement requirement, or where weight loading is a genuine constraint. Zero maintenance, lighter than concrete, and increasingly specified on publicly funded projects where net-zero and social value criteria apply. They won't give you the visual weight of concrete, and they're not a substitute for passive HVM. But if the brief is sustainability-first and the site doesn't need a permanent anchor, recycled plastic planters are worth the shortlist.
Which concrete planter shape fits your site?
Shape is the decision that most specifiers get to last but should reach first. The geometry of the site determines the planter shape, not the other way round. Broxap manufactures precast concrete planters in six configurations.
Rectangular concrete planters
Rectangular concrete planters are the most widely specified option and the natural choice for linear streetscapes, building frontages, and boundary planting. They run along edges cleanly, define pedestrian routes, and sit flush with building lines. For long frontages where visual continuity matters, a rectangular run is usually the most cost-effective answer.
Square concrete planters
Square concrete planters suit entrance courts, public squares, and grid-pattern planting arrangements. Deployed in pairs either side of an entrance, or in clusters across an open plaza, they bring a formality that rectangular units do not. The equal dimensions make them easier to reposition in multiples if the scheme layout changes.
Hexagonal concrete planters
Hexagonal concrete planters tessellate. That makes them the default for pedestrianised zones and campus settings where the brief asks for planting to cover the ground without leaving awkward gaps. Six-sided geometry allows patterns that circular or rectangular units cannot achieve, and the visual interest of a hexagonal arrangement can carry a scheme that would otherwise read as unremarkable.
Triangular concrete planters
Triangular concrete planters exist to solve a specific problem: the irregular corner or angular site that standard rectangular or square units leave partially unfilled. They're not a first choice for open schemes, but on sites with a diagonal boundary or an acute junction, they're often the only shape that works.
Corner concrete planters
Corner concrete planters are designed for L-shaped junctions and building corners. The angled profile fits neatly into 90-degree corners that a rectangular unit would overhang or leave with dead space. Specifiers working on schemes with a lot of right-angle geometry will often combine corner units with rectangular runs to create a continuous planted edge.
Large-format and bespoke concrete planters
For tree planting, landmark installations, and large-scale public realm schemes, the Andromeda concrete planter range offers the scale and soil volume that standard-format units cannot provide. The Andromeda is available in multiple configurations: mid square (1150 x 1150mm, 800mm high), low square (800 x 800mm), rectangular (from 1700 x 500mm) and large rectangular (2000 x 500mm). At this scale, loaded weight and site access become the critical specification questions. Bespoke sizing is available for schemes where standard dimensions do not fit the brief.
Matching shape to setting
Most schemes use more than one shape. A town centre redevelopment might run rectangular units along the high street frontage, square planters at the entrance to a pedestrianised zone, and corner units at the junctions where the two meet. The shape decision should follow the geometry, not precede it.
Town centre high streets and building frontages
Rectangular
They run parallel to the street, define edges, and guide pedestrian movement without interrupting sightlines.
Entrance courts and public squares
Square
Pair them symmetrically either side of an entrance or cluster in a grid for a formal arrangement.
Pedestrianised zones and campus plazas
Hexagonal
Tessellating geometry covers ground without gaps and creates visual interest at scale.
Tight corners and irregular footprints
Triangular and corner
Fill dead space that standard shapes would leave behind.
Tree planting and landmark sites
Large-format Andromeda.
The soil volume and visual weight to support mature planting and anchor a focal point.
Mixed schemes
Combine shapes along a single frontage
Rectangular for the run, square at the entrance, corner at the junctions.
The concrete material ties them together visually even when the geometries differ.
How do you write a concrete planter specification?
Begin with internal capacity and drainage. How much soil volume does the planting scheme require? Annual bedding needs far less than a shrub or tree. Specify the drainage outlet size and position: a blocked drain means a waterlogged root system and a dead plant. Alongside capacity, confirm the planter is steel-reinforced. Unreinforced concrete can crack under loading or frost.
Then look at weight, access, and finish together. A large concrete planter in its unloaded state may already exceed what a standard lorry-mounted crane can place in a tight town centre location. Get the loaded weight, confirm the site access, and ensure the groundworks can bear it. Some sites will need temporary traffic management for delivery. On finish, the options are smooth, exposed aggregate, acid-etched, polished, or painted, and the choice affects both the aesthetic and the maintenance requirement. Exposed aggregate hides minor surface damage better than smooth finishes; painted surfaces need periodic repainting. Specify the finish to match the wider street furniture scheme or existing materials nearby.
Finally, settle the fixing method and the whole-life cost. Most large concrete planters are effectively self-fixing by weight: you physically cannot move them without equipment. Smaller units may need surface-mounting or dowelling into the substrate if the site has any risk of vehicle contact or vandalism. On cost, concrete has no ongoing treatment requirement, which matters particularly on publicly maintained schemes where the maintenance budget is unlikely to keep pace with the original capital investment.
How do you shortlist a concrete planter supplier?
Concrete planters are a relatively concentrated market. Fewer suppliers manufacture them in-house than you might expect.
When shortlisting, the questions worth asking are:
How many geometric shapes does the supplier offer beyond the standard rectangle?
Are their planters precast and steel-reinforced, or cast in situ and unreinforced?
Do they manufacture in the UK, or is the product imported?
Can they deliver and install nationally?
Do they offer bespoke sizing for schemes where standard dimensions don't fit?
What is their track record on public realm projects at meaningful scale?
Broxap manufactures concrete planters in six geometric configurations (rectangular, square, hexagonal, triangular, corner, and large-format Andromeda) plus bespoke. All are precast and steel-reinforced. Finishes include smooth, exposed aggregate, and painted options. Manufacturing is at Broxap's own UK facilities, not resold or imported. Full design, manufacture, delivery, and installation is handled in-house, covering schemes across the UK. Broxap has been family-owned since 1946.
Two other suppliers worth considering: Iota Garden offers a contemporary concrete planter range aimed at commercial and architectural projects, with a design-led approach to form and finish. Furnitubes supplies concrete planters as part of wider public realm furniture packages, typically through project-based specifications for large-scale urban development schemes. Both are credible and worth including in a competitive shortlist depending on the type and scale of the project.
Planning a concrete planter scheme for a town centre, park, campus, or commercial development? Browse the full concrete planter range or request a specification quote.
Frequently Asked Questions
How do I specify concrete planters for town centres,
parks, and public spaces?
Work through shape first, then capacity, then finish. Choose the shape that fits the site geometry (rectangular for frontages, square for entrance courts, hexagonal for pedestrianised zones, triangular or corner for irregular sites, large-format for tree planting). Confirm the internal volume supports the planting scheme, specify drainage, and check that the loaded weight is compatible with site access and groundworks. Broxap manufactures precast concrete planters in six shapes at its UK facilities, with multiple finish options and bespoke sizing available. Browse the full range or contact Broxap directly for specification support.
What shapes do concrete planters come in?
Rectangular, square, hexagonal, triangular, corner, and large-format. Broxap manufactures all six. The Andromeda range covers large-format and bespoke requirements, with configurations from 800mm square up to 2000mm rectangular. Most public realm schemes use a combination of shapes — rectangular along the frontage, square at entrances, corner units at junctions.
How long do concrete planters last?
A well-specified concrete planter is designed for exceptional, multi-decade durability, offering a virtually permanent greening solution for high-traffic public environments. Because high-grade concrete does not rot, rust, or degrade under UV exposure, its ultimate longevity is determined primarily by the quality of the original specification and the mix design. This resilience makes it the lowest whole-life cost option of any planter material on the market.
How much do concrete planters weigh?
Weight varies significantly by size. Smaller square concrete planters typically run from 80 to 150kg unloaded; a large rectangular concrete planter or Andromeda can exceed 500kg before soil and planting is added. From confirmed Broxap product data: the circular concrete planter (1300mm diameter, 600mm high) weighs 630kg; the King's Lynn (1300mm diameter, 900mm high) weighs 600kg. Weight is the primary theft deterrent. Confirm that both site access and groundworks can support the loaded weight before specifying.
Are concrete planters better than steel or timber
planters?
Depends on the project. Concrete is the strongest choice for permanent, low-maintenance installations in high-traffic public environments. Steel planters are lighter and more relocatable, and suit schemes where flexibility or colour specification matters. Timber planters work well in heritage and park settings but require ongoing maintenance. Recycled plastic planters are maintenance-free and support sustainability scoring but carry less visual weight and offer no HVM function. Broxap manufactures all four materials — the right choice depends on the setting, the maintenance budget, and the procurement criteria.
Who manufactures concrete planters for public spaces in
the UK?
Iota Garden supplies a contemporary concrete planter range for commercial and architectural projects. Furnitubes supplies concrete planters through project-based specifications for large-scale developments. Broxap manufactures six shapes of precast, steel-reinforced concrete planter at its UK facilities — rectangular, square, hexagonal, triangular, corner, and large-format Andromeda — with multiple finish options, bespoke sizing, and a full installation service. Family-owned since 1946.