Comment by WalterBright

> In 1973, it decreed that factories of a certain size must allocate 20% of their surface area to green spaces.

This sounds like such a fine idea.

In my yard, I wanted to expand the parking space with some temporary parking, but didn't want ugly paving. With the generally wet weather, that meant mud and ruts. A contractor I talked to suggested "grasscrete".

https://grasscrete.com/

Mine is just using cinderblocks laid on their side. The vegetation grows up through the holes in the grasscrete, while the cinderblocks support the weight of the car without disrupting the vegetation. The holes let the water sink in instead of running off.

Over time, it has been colonized by native vegetation, and you can't even see the grasscrete. I've been very pleased with the results, and wonder why its use isn't common. It's rarely used for parking, which lets the vegetation recover.