Why floral foam is still everywhere and what is used instead
Walk into the back room of almost any commercial florist in the country on a Monday morning — the day after the weekend rush — and the floor will be scattered with crumbled green blocks. Floral foam, sold under brand names like Oasis and Smithers-Oasis, has been the structural backbone of arranged floristry since the 1950s, and despite nearly a decade of sustained criticism from environmental campaigners and progressive florists alike, it remains the default material for bridal work, sympathy tributes, and hotel lobby installations. The conversation around foam tends to get stuck in a binary: bad material versus virtuous alternatives. What that framing misses is the question of why it persists so stubbornly in professional settings where the people using it are often fully aware of its problems. The answer involves logistics, labour costs, client expectations, and the specific physics of keeping cut stems hydrated — and working through all of it honestly is more useful than another call to simply stop using it.
What floral foam actually is, and why it caught on so fast
Floral foam is a phenol-formaldehyde resin — a thermoset plastic, made by curing a polymer foam under heat and pressure, then treating it to absorb water rapidly. Vernon Smithers developed the first commercial version in the United States in 1954, and within two decades it had restructured the labour economics of large-scale floristry entirely. Before foam, keeping stems upright in a dense arrangement required wire, chicken mesh, hand-tied bundles, or the old pinholder frogs used in ikebana-influenced Western work. Each of these methods demands skill and time. Foam demanded neither, at least not at the level that mechanical alternatives do.
The material's uptake in commercial floristry during the 1970s and 1980s mapped almost exactly onto the expansion of supermarket flower departments and the growth of the wedding industry as a consumer category. Both sectors needed florists to produce high volumes of consistent arrangements quickly, often with less-experienced staff. Foam made that possible. A block soaked in water, a set of pre-cut stems pushed in at calculated angles, and a sympathy wreath that once took a skilled hand forty minutes now took fifteen. That efficiency saving compounded across every florist serving those markets, and it calcified into standard practice before the environmental profile of the material was seriously examined.
The environmental case against it, stated plainly
Floral foam does not biodegrade in any meaningful timeframe. It breaks down into microplastic particles — fragments small enough to pass through water treatment systems and enter waterways. Because it crumbles easily when handled and during disposal, it sheds those particles throughout its working life, not only at the end of it. The Sustainable Floristry Network has documented the material in composting streams across the industry, where it contaminates organic waste that florists and their clients assume is being processed cleanly. Some local councils now reject floral tributes left at cemeteries and memorial sites specifically because of foam contamination in the green-waste stream.
There are also worker exposure questions that receive less attention than the ecological ones. Phenol-formaldehyde resins release formaldehyde gas, classified as a Group 1 carcinogen by the International Agency for Research on Cancer, particularly when the foam is cut, shaped, or allowed to dry out. Florists working with foam daily in poorly ventilated spaces — a very common situation in small urban studios — are exposed to these compounds routinely. Industry bodies have been slow to issue formal guidance on this, and foam manufacturers' own safety data sheets recommend ventilation and gloves that most workroom conditions do not consistently provide.
Why the alternatives have not simply taken over
The alternatives to floral foam are real, functional, and increasingly refined. Chicken wire and wire mesh formed into armatures, water-filled bud vases clustered inside a larger vessel, water tubes (also called aqua picks) inserted into moss or bound stems, pinholders, and more recently, products like the Agra-Wool floral substrate and Florafoam's plant-based blocks — all of these can hold stems and deliver water. None of them does what foam does in quite the same way across every application simultaneously, which is the core of the persistence problem.
A large sympathy cross measuring sixty centimetres across, built for a funeral in three hours, with stems of chrysanthemums inserted at precise angles across a curved surface and then transported in a van, represents a set of structural demands that chicken wire addresses only with considerable additional skill and time. For a studio with one trained florist and two part-time assistants, switching materials for that piece means either retraining, slowing production, raising prices, or some combination of all three. Many florists have done exactly that — but it is not a frictionless transition, and presenting it as one does not help the florists who are genuinely trying to work through it.
There is also a client-expectation dimension that rarely appears in discussions aimed at the trade. Sympathy tributes in particular carry decades of visual convention — the tight, grid-like surface of a foam-built spray, the uniformity of stem depth and density. Alternatives that use moss bases or bound-stem structures look and feel different, and in the context of grief, difference can read as lesser. Studios like Green & Bloom in Edinburgh and Wild by Nature in Bristol have navigated this by building client education into their consultation process, showing physical samples and photographed work rather than simply announcing a material change.
How hand-built arrangements hold their shape without foam
The structural logic of a foam-free arrangement rests on two principles: mechanical support and consistent hydration. These are not the same problem, and conflating them is where many first attempts at foam-free work go wrong. A stem can be supported perfectly and still die within hours if its cut end is not in water. Conversely, a stem can be submerged in water and still collapse the arrangement if there is nothing preventing it from sliding sideways.
Chicken-wire armatures, built inside bowls, low vases, or compote vessels, address the mechanical support problem elegantly when the wire gauge is matched to the stem weight — a 50mm hexagonal mesh works well for medium-weight stems like roses and dahlias; a tighter 25mm mesh is better for finer stems like sweet peas or freesia. The wire is cut, crumpled loosely rather than folded into a rigid block, and secured across the vessel opening with waterproof tape or, in larger builds, fixed to the vessel itself with cable ties through the drainage holes. The vessel then holds water directly, so stem hydration is continuous rather than mediated through a soaked block that begins to dry from the outside inward.
For sculptural work — tall ceremony installations, hanging structures, or the kind of large-scale event floristry where arrangements must survive a full day of indoor heating and crowded rooms — water tubes are indispensable. Each tube holds roughly 30ml of water and can be refreshed in situ. When stems are anchored into a moss-and-wire base and each individual stem has its own tube, the arrangement's water supply is essentially modular. Florists working in this way describe the build process as slower at setup and faster at breakdown, because the components are designed to be dismantled cleanly rather than pulled apart from a disintegrating foam block.
The build process becomes slower at setup and faster at breakdown — and that shift in where the labour sits changes how a studio prices its work.
Where foam still makes a defensible case for itself
Intellectual honesty about this material requires acknowledging the applications where its alternatives genuinely struggle. Large-scale sympathy tributes built to a tight schedule are one. Another is work in extreme heat — outdoor summer weddings, marquee receptions in late July and August, where ambient temperatures can exceed 30°C inside a canvas structure and every minute of water access matters. A well-soaked foam block retains moisture longer than a shallow vessel of water that is evaporating rapidly, and for a bridal bouquet that will sit on a table in a hot marquee for four hours, that retention difference is not trivial.
There is also the question of accessibility. A florist with limited hand strength or reduced fine motor control — not an uncommon situation in a physically demanding trade where repetitive strain is widespread — may find that foam's compliance and ease of manipulation is not a preference but a genuine ergonomic requirement. Advocacy for material transition that does not account for the physical realities of the people doing the work is advocacy built on incomplete premises.
What a considered studio practice actually looks like in 2024
The florists making the most coherent case for foam reduction are the ones who have mapped their specific workflow and identified which applications can transition and which cannot yet, rather than announcing a blanket elimination. Asking which pieces genuinely require foam's unique combination of properties — and being rigorous about whether that requirement is technical or merely habitual — tends to produce a different answer than a simple audit of current materials.
Several London studios, including Worm London in Hackney and Grace & Thorn in Bethnal Green, have documented their transition processes publicly, showing which product categories they moved first (bud-vase centrepieces, hand-tied bouquets, small bud installations) and where they are still working through replacements (large sympathy work, outdoor event installations). That kind of granular, category-by-category account is far more instructive for a working florist than a generalist commitment to sustainability. It shows the decision-making rather than the conclusion.
At the same time, the plant-based foam substitutes arriving on the market are improving. Products made from agricultural byproducts — rice husks, coir fibre, and combinations of these with starch binders — are being tested in trade settings with increasing seriousness. None of them matches the original material on water retention and structural density simultaneously, but the gap is narrowing, and the studios actively testing these materials and feeding back to manufacturers are doing the most practically useful work in this space.
The question of floral foam is ultimately a question about how an industry changes its infrastructure when the change is real but inconvenient and unevenly distributed across different kinds of practice. Simple Willow Works thinks about this carefully, project by project. Get in touch if these are conversations worth having together.