On recent walks through various neighborhoods in San Francisco I was awed by brilliant bougainvillea blooming in profusion. The first picture is of a house in the Sea Cliff neighborhood. The next two shots are in Pacific Heights.
One tends to think of bougainvillea as a semi-tropical vine, more suited to warmer climes like San Diego, but they obviously flourish in San Francisco too. As you explore the City, you'll be surprised with what you find. (Did you know we also have flocks of wild parrots? More about that later.)