A Ceiba speciosa 'Majestic beauty' (Floss Silk tree): in bloom at the edge of the New park (used to be a parking lot) at Shotwell/17th/Folsom in the Mission. The tree and others nearby were planted in 1997. The species normally doesn’t do very well in San Francisco - it is much happier (and more common) in Southern California.
Ceanothus seems to be in bloom all over the city as I write (early April 2017). There are 50 or so speciesof Ceanothus, but very few that can be trained as a tree. Ceanothus 'Ray Hartman" is one - it's a hybrid (cross) between two parent species: Ceanothus arboreus from Catalina Island in southern California, and the northern California Ceanothus griseus. It’s the only Ceanothus planted as a street tree in San Francisco, and one of the very few California natives that you’ll see planted in sidewalk cuts on the street (along with Catalina ironwood).
These trees in Cole Valley at the corner of Waller and Cole are some of the best in San Francisco.
(And I wish I knew who this "Ray Hartman" was/is - doesn't seem to be any info on the web about him. Let me know if you know!
Just got back from a week in the Azores - Sao Miguel and Terceira islands. The Azores are Portuguese islands in the middle of the Atlantic Ocean - 800 miles west of Portugal, and about 2000 miles east of Boston - volcanic islands, with a mild, San Francisco-like climate (coastal, rarely above 80 degrees fahrenheit, and rarely below 45 degrees).
It was interesting to see so many introduced trees in the Azores that are popular as ornamentals here in San Francisco. Metrosideros excelsa (New Zealand Christmas tree) is often used as an ornamental, but also naturalized in the forests of hte islands (which I have never seen here in California). The New Zealand Christmas tree in the photo above was a huge specimen in Ponta Delgada, the capital city of the Azores - so big that it had supports to hold up its limbs - if you look carefully you'll see the many vertical steel supports. Araucarias are everywhere as specimen trees -- especially Norfolk Island Pine trees. (The Norfolk Island Pine in the photo below was a young specimen just outside our hotel window in Angra de Heroismo, the largest city on Terceira Island- the hotel was in an early 1600s stone fort built by the Spanish during a 40 year period when they controlled the islands). And Pittosporum undulatum (Victorian box) is everywhere as a naturalized tree - to the point where there were forests of the tree - it has become an ecological problem on the islands.
There are trees that are native to the Azores - in fact endemic to them (found in nature only there). It was interesting to see native species that were closely related to trees I recognized, but which had developed into separate species as a result of the physical isolation of the islands. Laurus azorica, for example, was obviously a close relative of the Grecian bay (Laurus nobilis) that is found on our streets.
And London planes (Platanus X acerifolia) lining the roads everywhere. The trees below were in a back road on Terceira island.
I've been a San Francisco tree advocate for a long time. I serve on the City's Urban Forestry Council; authored Trees of San Francisco, and have a 25+ years with Friends of the Urban Forest as volunteer and past board member and board president. In all of my years of tree advocacy, there's never been anything on the election ballot as important to our city's urban forest as this November's Proposition E - and big kudos to Supervisor Scott Wiener for his leadership in bringing it to the ballot..
The biggest problem with San Francisco's trees has always been the lack of care and maintenance. We're doing a good job of planting trees, thanks to groups like Friends of the Urban Forest. But we do a miserable job of caring for them. The city makes residents pay for pruning their trees - but most residents either don't know that, or can't afford to pay for tree care. The result is trees that are unhealthy, look terrible, and in many cases are dangerous.
Prop E would shift all responsibility for tree care and sidewalk repairs to the City, where it belongs, ensuring that our trees receive regular, periodic pruning and care from trained professionals. VOTE YES ON PROP E! And be sure to like the Facebook Page for Prop E!