Excited to see this monkey puzzle tree (Araucaria arcaucana) in the Presidio ≈doing well. It's between two beautiful Queen Anne Victorians on Presidio Boulevard just west of Funston Avenue. Monkey puzzles are native to Chile and western Argentina; they're related to other trees in the Auraucaria family, such as Norfolk Island Pine, cook pines, and bunya bunyas. The origin of the name 'monkey puzzle' derives from its early cultivation in England around 1850, when the species was still very rare in gardens and not widely known. Sir William Moleswort, the owner of a young specimen at Pencarrow garden near Bodmin in Cornwall, was showing it to some friends, when one of them remarked, "It would puzzle a monkey to climb that". As the species had no popular name, first 'monkey puzzler', then 'monkey puzzle' stuck. Very glad to see the Presidio planting interesting trees like this. (I wish they would plant some Wollemi pines (Wollemia nobilis) (hint, hint!)).
Plum trees (*not* cherries - they come next month!) have been blooming all over the city this past week. My neighborhood of Parnassus Heights is famous for its plum trees - here are a couple photos from my block of the two most common varieties of plum in San Francisco. The most common is the purple leaf plum (Prunus cerasifera), and of the many varieties of this species '‘Krauter Vesuvius’ is the one you see most in the City.. Back in the 1990s this was actually the most commonly planted tree in San Francisco, according to Friends of the Urban Forest records. It's less common now (in part because I think the planting managers at FUF rightly think it's over-planted), but still popular, and after years of popularity, there are hundreds (thousands?) of them around the city. The tree is gorgeous for 10 days in February, and I'm afraid that period is now just about over.
The second, and less common, type of plum is Prunus x blireana, or Blireana plum. The tree has double flowers that look a bit like carnations, with deeper pink than its more common relative, and the blooms last longer. This tree is a hybrid of Prunus cerasifera 'Atropurpurea' and a double form of Prunus mume. It was developed in France and introduced in 1906.
Ginkgoes are famous for dropping leaves all at once - often almost all of the leaves drop on a single day. I think today's the day.
Justin Herman Plaza
On the south side of 23rd Street between Shotwell and Folsom is a fenced-in property (a white fence stretches most of the block between Shotwell and Folsom Streets). The owner of the property is the Kaliflower commune, a group with a colorful history that has been in existence since the 1960s, and in this location since 1974. The commune tends a small orchard over the fence, with citrus and avocado trees. (You often can see avocados hanging in the trees.) The group also planted the food-producing Spanish chestnuts (Castanea sativa) and almond trees (Prunus dulcis) fronting the property. (The chestnuts and almonds are the only examples of each that I know of on San Francisco streets.) And as of when I walked by earlier today someone had planted an artichoke in an empty tree basin.
As I write this in late November, the sidewalk underfoot is thick with the prickly shells of the chestnuts, which had come out earlier in the fall.
Female ginkgos are at peak fruit drop now, dropping their malodorous fruit (smells like vomit - caused by the release of butyric acid, which also gives rancid butter its horrible smell). This photo was taken on the sidewalk outside 1044 Shrader (cross street Carl), in Cole Valley. There aren't many places in San Francisco where you can find the female of the species, which is why I created a page in Trees of San Francisco listing all of the SF locations where I knew of female ginkgos. Particularly if you have a pre-adolescent boy in the house, now is the time to experience one of nature's most unusual and interesting smells!
No one really knows why ginkgos adapted to have smelly fruit, but the best guess is that it was attractive to an animal, which helped the plant disperse its seeds. You hear stories of dogs, for example, eating ginkgo seeds. But since ginkgos have been around for hundreds of millions of years, the interesting question is, are the things that adapted to disperse it still around? Or are they extinct?