"Toyota Roof Garden (subsidiary of the car company) is now taking orders for its modular grass tiles...
Individual mats are twenty inches square, and about two inches thick. The mats are planted with a special brand of Korean velvet grass - it only needs to be cut once per year. The mats are irrigation system-ready; water can flow through tubes to channels in the mats, providing moisture to roots.
The price? Just $43 per square yard."