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Mystery trees of Tel Aviv

Sometimes reference librarians ask ourselves questions—especially in times of social isolation! Since libraries are closed, I have been rereading my own collection of books. When I Lived in Modern Times is a novel by Linda Grant, set in 1940s Tel Aviv before Israel became a state. The main character refers several times to unnamed trees that are growing along Rothschild Boulevard (Sderot Rothschild). The trees are noteworthy, yet she cannot identify them. After having read this book twenty years ago, I decided it was time to solve the mystery!

 

[mysterytrees] cover

By searching Google Maps, I could see there were two main types of trees. It’s a mile-long road with a central pedestrian thoroughfare, and in researching sources like Tel Aviv municipal archives and local news, I determined that both Delonix regia and Ficus (F. microcarpa and F. sycomorus) grow there. Delonix, native to Madagascar, was introduced to Israel in the 1920s and may have been planted on the boulevard then or later. The trees are depicted in a 1937 painting by Yehezkel Streichman, “The Kiosk on Rothschild Boulevard.” The ficus trees on Rothschild Boulevard were planted in the 1930s. Although jacaranda trees are mentioned in various historical sources, I did not see contemporary images of them, though a 1946 photo of Rothschild Boulevard at the intersection of Allenby Street (the very corner mentioned in Grant’s novel) shows jacaranda and ficus branches overhanging a photographer’s sidewalk photo-shoot.

Tel Aviv’s founders—with one exception—believed they could ‘make something from nothing’ (yesh me’ayin) of this sandy location. The lone dissenter thought it folly and, in a 1909 photo celebrating the city’s founding, he stands far apart from the others, atop a distant dune, possibly still muttering ‘crazy people, there’s no water here’ (meshuga’im—ayn kan mayim!).

Rothschild Boulevard was built in 1910, utilizing a sand-filled wadi (dry riverbed) which was not stable enough for buildings. The street’s original name was Rehov Ha’Am, Street of the Nation (or the People). Cypresses formed the outline of the boulevard’s edges, with grass and flowerbeds in the middle.

The city’s first mayor Meir Dizengoff had grand and somewhat impractical urban planning ideas. He wanted to impress Winston Churchill (who was due for a visit in 1921) by creating a tree-lined boulevard to rival any in Europe. Mature trees were transplanted from nearby locations, but they did not have time to establish themselves in the arid soil. When people thronged to see Churchill, some climbed the trees, toppling them. Churchill reportedly said, “That which has no roots is bound to wither,” a sly, barbed remark, coming from the man who was Secretary of State for the Colonies during the period of the British Mandate in Palestine.

In 1925, Patrick Geddes, a Scottish botanist and town planner, produced a plan for Tel Aviv. He envisioned a “garden city,” with a blend of “mainways” (for vehicles) and “homeways” (residential interior streets), and a series of east-west green boulevards to connect key urban sites, so the city would have a strong sense of nature.

To this day, Rothschild Boulevard is a well-used tree-lined corridor through the heart of a busy city. Just as we have cherry blossom mania in spring here in Seattle, there is great excitement when the red flowers of Delonix regia (known as flame tree, Royal Poinciana, Flamboyant, Gulmohar, and in Hebrew tze’elon naeh) bloom in early June. The ficus trees with their pale trunks sometimes covered in a net of accessory trunks made of aerial roots, are stately but drop fruit that can be perilous for pedestrians. Still, they are a notable feature of the landscape; Tel Aviv-Yafo municipal agronomist Haim Gavriel even published a recent monograph about the Ficus of Israel’s Boulevards.

Resources that were useful in researching this mystery include:

  • Mann, Barbara. A Place in History: Modernism, Tel Aviv, and the Creation of Jewish Urban Space. Stanford University Press, 2006. [accessed online 4/25/2020]
  • Mann, Barbara. “Tel Aviv’s Rothschild: When a boulevard becomes a monument.” Jewish Social Studies, New Series, Vol. 7, No. 2 (Winter, 2001), pp. 1-38. [accessed online 4/24/2020]
  • Rosenberg, Elissa. “Tel Aviv never stops.” Landscape Architecture Magazine 107 (11), 120-128
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cherry tree blossoms in February?

Is it possible that I’m seeing cherry trees flowering this early (mid-February)? Some have white flowers, and some are pink.

 

It is certainly true that things may be flowering early when we have a mild winter. In 2014, the famous cherry blossoms in the University of Washington’s Quad began opening on March 13, and the winter of 2015 was warm, so they may be opening earlier than that. While it is possible you are seeing flowering ornamental cherries (Prunus species), they are easily confused with their cousins in the same genus, flowering ornamental plums–extremely common street trees in Seattle–most of which are definitely flowering now. Ornamental pears (Pyrus) are also flowering now. They have white petals, and might be mistaken for cherry trees as well but the distinctive odor of pear blossoms is a big clue to their true identity: acrid, astringent, and just plain stinky!

The Vancouver Cherry Blossom Festival offers some pointers on how to tell the difference between cherry and plum blossoms. Most cherry blossoms aren’t noticeably fragrant, while plum blossoms are fragrant. Cherry blossoms usually have small splits or indentations at the ends of their petals. Note, however, that the book Japanese Flowering Cherries by Wybe Kuitert (Timber Press, 1999) says cherry “petals are mostly [emphasis mine] retuse,” that is, not all of them have a shallow notch or split on the ends of the petals.

Project BudBurst, a citizen-science phenology project, offers this distinction: apple blossoms have 3 to 5 styles whereas cherries have one. And what is a style? It is the part of the pistil between the stigma and the ovary. Brooklyn Botanic Garden also has a helpful guide to flowering trees that are not cherries.

According to the British Natural History Museum, one unifying characteristic of cherries is “flowers in clusters with stalks all arising from a central point, or arranged along a short stem, or in spikes.”

cotton woods and slope stabilization

When a cottonwood tree is cut down, does the stump die, or does it send out shoots that grow into more trees?

And, if a cottonwood tree located on a hillside is cut down, what is the risk of erosion?

 

As it turns out, some poplars and cottonwoods sucker from the roots and some do not. Determining what kind of cottonwood you have is the key to answering this question.

Identifying tree varieties can be tricky. The best way to get a positive ID is to take a sample to the Hyde Herbarium at the Center for Urban Horticulture (near the University of Washington). It is definitely worth a visit, as it is the only herbarium on the West Coast that serves the public.

Hours, driving directions, how to collect specimens, etc. are on the Hyde Herbarium page.

As for your second question, here is what the Washington State Department of Ecology’s Vegetation Management: A Guide for Puget Sound Bluff Property Owners has to say (p.25):
Given the importance of tree cover on potentially unstable slopes and the advisability of retaining them for erosion control purposes, a landowner should explore alternative options to tree removal or topping…[if a tree must be cut] stumps and root systems should be left undisturbed…[to reduce the risk of erosion].

A companion website from the Washington State Dept. of Ecology contains a great list of groundcovers, shrubs and trees that will help keep your slope intact if you decide to remove the cottonwood. The website includes a Plant Selection
guide.

on sourcing oak logs

I am looking for advice on how to obtain an oak log or two. I got some shiitake mushroom starter plugs at the garden show in Seattle, and it seems that they grow best on oak logs. But I am having the hardest time trying to find one or two oak logs to plant them in. I’ve tried craigslist, and can’t seem to find a thing. My tree identification skills are not exactly up to par, and I don’t know the rules for cutting parts of trees in the forest, so I wonder if you have any advice for a novice mushroom grower. I really only need two logs, about 6 inches in diameter and maybe 3-4 feet long. This is proving to be a much more daunting task than I ever imagined!

 

Have you tried contacting Plant Amnesty? They maintain a list of certified arborists, some of whom will probably have occasion to prune or cut down an oak tree at some point. That might be one way of obtaining a log.

You might also try posting on the Pacific Northwest Garden Exchange (watch out–annoying ads!).

As far as cutting branches on public forest land, you should contact the Washington Department of Natural Resources before proceeding. They have information on harvesting and collecting forest products, and how to obtain a firewood permit.

Once oak trees have leafed out fully, they should be easier to identify. See the following tree identification guides:

Oregon State University: Landscape Plants

The site features images and information on over 900 landscape plants (mostly woody) listed in alphabetical order by genus. Use the Plant Search to filter by attributes such as flower color or leaf shape to narrow down the possibilities.

Oregon State University: Trees of the Pacific Northwest

This site provides assistance with identifying common conifers in the Pacific Northwest. It includes information about specific genera, user-friendly dichotomous keys, and a mystery tree section where you can test your knowledge.

What Tree is That?

The National Arbor Day Foundation’s version of a tree identification tool. A series of pictures and questions are used like a dichotomous key to identify mystery trees by process of elimination. A very good animated interactive tutorial illustrates how to use a dichotomous key.

What Tree Is It?

Help with identifying trees by leaf, by fruit and by name–click on the chain of illustrated characteristics (fruit, leaf) for the tree you want to identify until you narrow it down to a genus and species with the help of this informative website. It features common trees of Ohio.

UConn Plant Database

This site includes information about trees, shrubs and vines that do particularly well in the Northeastern United States. You may search for plants by attribute or characteristic, or you may browse by Latin name. Each entry has a fact sheet, photos and a list of cultivars, if available.

Virginia Tech Dendrology Tools

If you have an unknown tree specimen, you can try to figure out what it is by using one Virginia Tech’s leaf or twig keys.