This is a crucial question for urban gardeners. The direct answer is: it is generally not recommended and often illegal to place planter boxes on a fire escape. Fire escapes are designated emergency exit routes, and obstructing them with any items, including planters, can pose a serious safety hazard by blocking access for residents or firefighters during an emergency. Most local fire codes strictly prohibit this.
However, you can create a similar aesthetic safely. Consider mounting planter boxes directly onto the balcony or window sill *adjacent to* the fire escape, ensuring the escape route remains completely clear. Opt for lightweight, durable materials like fiberglass or certain metals to minimize weight. Always prioritize safety and check your local municipal fire and building codes before installing any structures. For a verdant touch without the risk, explore vertical wall planters on your balcony wall or use compact plant stands that keep pathways open. Responsible urban gardening means never compromising on safety.