I know Trachycarpus fortunei (windmill palm) is one of the most cold-tolerant of palms, but I was still surprised to see a mature specimen in Paris, near Square Thomas Jefferson on the right bank of the Seine.
I can't remember seeing one of these before in San Francisco. My husband took me this past weekend to his new favorite dog park (our dog Mather, named after the San Francisco Sierra camp, needed a run). It's a flat area in Corona Heights Park that you can access either from State Street or from Flint Street. (If you're approaching from Flint, walk past the tennis courts; if you came up the driveway from State Street, walk past the basketball courts.) You'll come to a dog park adjacent to some community garden plots. - and in between the two, this Dracaena draco - the common name is Canary Islands dragon tree.
The plant (not really a tree - it's a monocot with a tree-like growth habit) is native to the Canary Islands, Madeira, Cape Verde and western Morocco. There's a beautiful example of this tree at the Hotel Coronado in San Diego; the two largest in California are both in the Santa Barbara area - one at the Sotto il Monte Estate in Montesito, and the second at Mount Calvary Monastery behind the Santa Barbara Mission. in Santa Barbara. But you don't see them often this far north. I'll actually be in Madeira in two weeks, and will update this with new photos if I see some!
I've been doing a "Cole Valley Tree of the Month" series for some time in the Cole Valley Facebook group, and when I walked by this tree yesterday at the corner of Grattan and Shrader Streets in Cole Valley, I grabbed my iPhone, shot this picture and made it the "Cole Valley tree of January" - only to be reminded that it happened to be the first of February! It's just that I associate this tree - Bailey's acacia, or Acacia baileyana, with January blooms. Bailey's acacia is the first tree to bloom in the spring (after 30 years in San Francisco, it still seems weird to me to call January “spring”), and the brilliant yellow flowers are eye-catching. The tree is native to Australia, where it’s called “Cootamundra wattle”, as it's native to Cootamundra, New South Wales, just west of Canberra. (The town holds a 'Wattle Time' festival every year when the trees start to bloom.)
Acacias do put out a good amount of pollen, but the pollen is only mildly allergenic, and it's heavy, which means it exists only in the immediate vicinity of the trees. You're much more likely to suffer allergies from oaks, elms, pines, and and other wind-pollinated trees - the inconspicuous flowers of those trees don't get noticed, but they put out great quantities of lightweight pollen. Trees with colorful flowers aren't as likely to cause allergic reactions since the pollen is heavy and sticky (it's designed to stick to insect pollinators, who are attracted by the flower's color).
Just got back from a 2 week trip to New Zealand - it's been my #1 "bucket list" place for a long time. I was especially excited to see trees that are San Francisco street trees (New Zealand Christmas trees, giant dracaena, tea trees, etc.) in their native habitat.
One thing I noticed was LOTS of Monterey cypress (Cupressus macrocarpa) and Monterey pine (Pinus radiata, which the New Zealanders call "Radiata pine") in the countryside, used as windbreaks, shade for sheep and other livestock, accent trees, etc. Which made big parts of the countryside look a lot like California! There were also many stands of Monterey pine used used as lumber trees - without any evidence of pine canker that i could see.
Northern hemisphere conifers (Douglas fir is a prominent example) have become naturalized in big parts of New Zealand, and have become invasive pests, taking over entire landscapes. Interestingly, our Monterey pine and Monterey cypress are not invasive, because the cones of the tree typically only open and disburse their seeds where there is fire or extremely hot weather.
I spent three days hiking through native beech forest on the Routeburn Track on the South Island. It was very cool to see forests composed almost entirely of different species of Nothofagus (a cousin of our northern hemisphere beeches) because they were so new to me (the only Nothofagus I can remember seeing here in CA was a giant specimen at Filoli, south of San Francisco). One cool tree I encountered along the way: the tree fuchsia - Fuchsia excorticata, the world's largest fuchsia, with distinctive papery bark (and recognizable fuchsia flowers).
Of course, I made a point to find New Zealand Christmas trees (Metrosideros excelsa) on the North Island, although sadly by the time we got there on January 2, they were almost all out of bloom (these native trees seemed to be strict about blooming at Christmas time). They're called by the Mauri name "Pohutukawa" in New Zealand, and the New Zealanders were very surprised to find that they were popular street trees in San Francisco.
Sadly we didn’t get to see any Nikau palms (New Zealand's only native palm, and one of my favorites of the palms) in their glory - saw a few of them planted as street trees (!) in Whangarei in the north island, and every once in a while saw one in the kauri forest on the west side of the north island. I was surprised to find that the best places to see them in New Zealand were on the west side of the cooler south island.
It was a great trip - New Zealand is a great place to visit for many reasons, and interesting trees is definitely one of them!
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.