The structure: a finish, not a colour to choose
The wrought-iron structure gets a matte black epoxy paint — the most common finish across the network, chosen for its weather resistance and discretion in a garden or on a balcony. It's the inner liner, in direct contact with damp soil, that really determines how long the box lasts.
The three liners available
- Zinc
- Weight: Light — estimated lifespan: 15 to 20 years — care: Natural patina, no particular upkeep
- Stainless steel
- Weight: Medium — estimated lifespan: 25 years and more — care: Rust-proof, occasional rinsing is enough
- Technical plastic
- Weight: The lightest — estimated lifespan: 10 to 15 years — care: Replace if cracked, the most budget-friendly option
| Liner | Weight | Estimated lifespan | Care |
|---|---|---|---|
| Zinc | Light | 15 to 20 years | Natural patina, no particular upkeep |
| Stainless steel | Medium | 25 years and more | Rust-proof, occasional rinsing is enough |
| Technical plastic | The lightest | 10 to 15 years | Replace if cracked, the most budget-friendly option |
Why the liner depends on exposure
On a balcony heavily exposed to sea spray or frequent watering, stainless steel stays the most durable liner despite the extra cost. Zinc offers a good weight/lifespan compromise for everyday use. The technical plastic liner, the lightest, suits a window size where total weight matters more than maximum longevity.
See also the care and drainage guide, which details the drainage layer to set at the bottom of each liner depending on exposure.