Where a plant pushes up through cracked concrete, soil and pavement have already started to negotiate. Designer Sara Fernandes wants to formalize that negotiation. Her prototype cuts openings into a perforated corten steel curb so that low plants can cross it on purpose.
The project, Giving Nature a Voice: Let Them Through, replaces a solid cast-concrete curb with weathered Corten steel. Circular holes of varying diameter run through the profile. They sit at irregular intervals, so the edge remains visible but no longer forms a continuous wall.
Starting from the cracks
Fernandes based the design on plants that emerge through fractured pavement. Instead of waiting for a boundary to fail, she built the failure in as a feature. Fernandes, an architectural designer based in California, describes her practice as sitting between architecture, art and ecology, according to her website.
Reclaiming hard ground is not only a botanical story, and artists have turned abandoned spaces into work built from earth itself. Soil and Straw Turn Destruction into Art shows how raw earth can carry a sculptural idea.
The mechanism is simple to read. Adjacent soil and low vegetation can pass through the openings. The steel stays in place, so the curb still defines the walking surface. A boundary that still reads as a boundary, yet admits some movement, is a more specific idea than removing a section of curb altogether.
Material and surface of the perforated corten steel curb
The steel is weathered Corten, and its patina is central to the look. Designboom’s coverage says the weathered patina creates a tonal bridge between raw earth and paved surfaces. A new, untreated steel curb would suggest a finish that must stay clean. Weathering suggests the edge is meant to change.
Who the path is for
A planted edge raises a practical question about the sidewalk beside it. Wheelchair users, people pushing strollers and pedestrians with limited vision all depend on a clear, predictable surface. Any developed version of this curb would need to decide where growth is welcome and where a clear route comes first.
Any curb that admits growth also has to keep a route clear for everyone using it. Oxford Street’s Bold Makeover: New Green Spaces and Pedestrian Zone offers a useful comparison, showing how a busy street can add greenery while prioritising walkers.
Open questions
Maintenance is the next test. The project materials do not address how the openings in this steel edge handle leaf litter, how loose soil is kept in place, or what happens when plants spread beyond their zone. Those answers would come from testing in real conditions. The people who maintain a path should help set its design from the start.
The sources describe Let Them Through as a conceptual prototype, not a mass-produced municipal curb. They offer no drainage measurements and no ecological data. Claims about water management or urban habitat would need their own evidence before anyone accepts them.
A longer installation could show how much openness an edge can take before it needs adjusting. It would also reveal how a curb performs under bicycle tires, wet weather and daily foot traffic. Until then, the prototype asks a useful question: how much give can a city’s edge tolerate before it stops working as an edge?
H/T yankodesign.com
Frequently asked questions
What is the Giving Nature a Voice: Let Them Through project?
It is a conceptual prototype by designer Sara Fernandes that replaces a solid cast-concrete curb with perforated, weathered Corten steel. Circular holes of varying diameter sit at irregular intervals along the profile so that low plants can cross the curb on purpose. The article describes it as a prototype, not a mass-produced municipal curb.
What inspired the design of the perforated steel curb?
Fernandes based the design on plants that emerge through cracks in fractured pavement. Instead of waiting for a boundary to fail, she built that failure into the design as a feature.
Does the perforated steel curb still define the walking surface?
Yes, the steel stays in place, so the curb still defines the walking surface. The openings let adjacent soil and low vegetation pass through, but the edge remains visible rather than forming a continuous wall.
Why is the curb made of weathered Corten steel instead of new steel?
A new, untreated steel curb would suggest a finish that must stay clean, while weathering suggests the edge is meant to change. According to Designboom’s coverage cited in the article, the weathered patina also creates a tonal bridge between raw earth and paved surfaces.
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