That sounds like a wild dream, but it’s not totally out of reach. First, the moss and vines need constant moisture, so you’d want a lightweight misting system—tiny, battery‑powered pumps that spray a fine mist every few minutes. You could run the mist through a fine mesh so it doesn’t get sucked into the fan. Next, you’ll need shade, especially for the ferns that hate the bright sun of the upper city. A translucent fabric canopy that lets light in but blocks the harsh glare would keep them cool. Don’t forget about airflow—plants need oxygen, so a small, quiet fan that keeps the air moving without blowing the vines away is essential. Finally, to keep the weight down, use living panels of micro‑greenhouses: thin layers of soil packed with nutrient‑rich compost, and let the vines climb up the support structure while the moss stays glued to the base. It’s a bit of a balancing act, but with the right mist, shade, and airflow, you could give the city a living runway that’s as gentle on the plants as it is on the wind.