Marcia Adair

Strategy + Experiments

Growth

What happens when a traffic island becomes a garden?

A public planting experiment on Kempener Straße in Nippes, Cologne: an unloved heat sink in the middle of the road, turned into something regenerative for plants and neighbours.

Public spaceCommunityPlanting design

Client
Self-initiated, with neighbours
Where
Kempener Str, Nippes
Role
Design, planting, organising
Since
2022

8 weeks

without rain in summer 2026, and no tap on the island

Young lavender planted in fresh soil on the island, street behind
Red and orange dahlias against the sky
Pink cosmos and a white dahlia

Then and now

Car park, wasteland, garden

Black-and-white photo of cars parked on the island, 1958The island in 1999, overgrown, with houses behindDahlias and orange flowers planted around a tree on the island

In the 1950s the island was a car park. Nature reclaimed it, growing through the cracks in the asphalt until it had taken over. Effective, but not pretty. The project replaces that with a perennial garden that can look after itself.

The site

Not the ideal place to start a garden

Sun
Full sun all day
Soil
Poor and stony
Wind
Open on every side, strong gusts
Water
No connection on the island
Traffic
Seen from every side, plenty of dogs

Grasses and tough perennials face the street; the more delicate planting sits inside, where nobody walks through.

The approach

Four ideas behind every plant choice

Benign neglectDesign as if nobody will look after it. Plants that stay put, stay out of the road, dig up easily and need little care or water.
Natural gardeningPlant for the conditions that exist instead of irrigating to suit the plants.
Neighbourhood regreeningSelf-seeders and easy dividers, passed on so neighbours can start their own small islands with plants proven here.
JoyThe best reason to do it. Bees, butterflies and birds, and a rare chance for city people to get their hands in the soil.

Water without a tap

Getting water to the roots, slowly

Deep pipesPVC pipes sunk with an auger take water straight down to the roots.
OllasBuried terracotta pots seep water into the soil around them.
500 LA rain barrel buried on the island, to be fitted with a hand pump anyone can use.

The garden

First seasons

Pink snapdragons with ornamental grass behind
Magenta dahlia with the street behind
Freshly cut lavender on a wooden board
A single pink flower in mulched soil
Photo to come
Photo to come
Photo to come

The plan

From experiment to a garden that runs itself

Phase 1Experiment2022–2026
Phase 2 · nowPlan and prepareAutumn 2026, spring 2027
Phase 3Enjoy and learnSummer 2027
Phase 4Adjust and improveAutumn 2027

Ten beds now run round the island, each with its own character, from a cottage-garden corner to a Mediterranean strip by the bus stop. Neighbours help with cash, plants from a wish list, soil, mulch and work days organised in a WhatsApp group. Finishing the beds takes about 2,500 litres of soil and 1,000 of mulch.

A project that has to run without you?

Designing for your own redundancy works for businesses too.

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