In a spring escape, I was in San Francisco in late March. We visited museums, parks, and restaurants.
 |
| Roof, California Academy of Sciences |
I had not been to the California Academy of Sciences in more than 20 years. In that period, the building was completely rebuilt, with a green roof. I had been doubtful about green roofs--where people grow plants on the roof. I know they have been used for millennia in parts of Europe, but those are wetter climates than San Francisco. So I wondered about watering and keeping plants alive in shallow soils. Or, if the soils aren't shallow, the weight on the roof.