Self-Guided Tree Walk: Barron Park

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The Barron Park Tree Walk begins at Cornelis Bol Park near the intersection of Laguna Avenue and Laguna Court.

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1. Coast Redwood (Sequoia sempervirens)

Grove on the left side of the park near the neighborhood bulletin board

This lawn setting with nearby Matadero Creek is a good setting for these thirsty trees, which were planted here in 1973. In their natural setting in foggy coastal locations, they are able to take moisture from the fog. Planting them in groves mimics their natural growth habit; they have shallow roots and the intertwining of the roots of adjacent trees helps hold them up.

2. California Buckeye (Aesculus californica)

2 trees on the creek banks next to the "Matadero 1933" bridge on Laguna Avenue on the side opposite the park

These trees are among the first to leaf out in spring and the first to lose their leaves in mid-summer. They are native to this area and were used as a source of food by many California Native American tribes. Eaten raw the seeds are poisonous, but a lengthy leaching process makes them safe to eat.

3. Arbutus Marina (Arbutus 'Marina')

3743 Laguna Avenue, 4 small trees in the front yard

These evergreen trees with peeling red bark are an excellent choice for a low-water garden. They grow in multi-stemmed and single-trunk forms and have strawberry-like fruit that is attractive to birds. The fruit is safe for humans to eat, but doesn't have much flavor. Full grown, they are usually less than 30' and almost as wide.

4. Coast Live Oak (Quercus agrifolia)

896 La Para Avenue, in wall semicircle on Laguna Avenue

The Coast Live Oak is an evergreen tree that is native throughout much of California. They grow relatively quickly to 70' with an equal spread. Once established, they take drought well. The acorns that drop in the fall can produce young oaks very readily. There are several things that can cause the health of this tree to deteriorate: summer watering, heavy construction equipment parked on top of its root system, and soil compactions anywhere from the trunk to the outer edge of the canopy.

5. Douglas Fir (Pseudotsuga menziesii)

890 La Para Avenue, left front corner

Douglas Firs are easy to recognize by their cones. The cones point down and papery bracts with three points each stick out between the scales of the cones. Environmental conditions influence the appearance of the tree. Where summers are dry, it is dense with shorter spaces between branches, as with this specimen. Where moisture or shade is abundant, it appears thin and gawky.

6. Victorian Box (Pittosporum undulatum)

879 La Para Avenue, right side of the front yard

This attractive Australian tree has glossy 4–6" leaves that have undulating edges. Fragrant white 1/2" flowers are followed by yellow-orange marble-sized fruits that open to display sticky seeds. This stickiness causes them to stick to birds, which aids in their dispersal.

7. Atlas Cedar (Cedrus atlantica 'Glauca')

858 La Para Avenue, center front yard

This large, majestic tree, native to the Mediterranean, was used for shipbuilding in ancient Greece. Leaf clusters on the tops of the branches and shorter, stiffer needles distinguish this cedar from the Deodar Cedar.

8a. Aleppo Pine (Pinus halepensis)

833 La Para Avenue, right of the driveway near the street

This mature tree is unusually large for its species. The Aleppo Pine is native to the Mediterranean region and grows 30–70' with a variable canopy shape. Fast-growing Aleppo Pines are well adapted to our climate, as this tree demonstrates.

8b. Silver-dollar Gum (Eucalyptus polyanthemos)

833 La Para Avenue, look from the left driveway, left of the garage

Proceed down La Para Avenue to the second driveway for this property. This extremely large eucalyptus grows almost anywhere except for wet places. The flowers are seen as large masses of pink in December through June.

9a. European Smoketree (Cotinus coggygria)

816 La Para Avenue, center front

A small tree that gets its name from the dramatic puffs of "smoke" from fading flowers. These puffs are stalks of long, fuzzy lavender-pink hairs that emerge from the faded flowers. Many cultivars, with different leaf colors, are available. All types turn a mix of colors in the fall.

9b. Olive (Olea europaea)

816 La Para Avenue, right side

This attractive small tree has a rich history, from Athens and the ancient world, to their introduction to the California mission gardens by Father Junipero Serra. This tough tree can be transplanted even when large and withstands dry gardens. If it is a fruiting variety (or a non-fruiting variety that fruits anyway!), it is important to locate the tree where olives will not leave stains and make a mess on pavement.

10a. Mimosa (Albizia julibrissin)

766 La Para Avenue, left front corner

This fast-growing deciduous tree takes a distinctive umbrella form as it matures. In summer it is covered with fluffy pink flowers. The flowers are a bit messy, so the tree is best planted among planting beds. It attracts birds to the garden and is native throughout Asia from Iran to Japan.

10b. Honey Locust (Gleditsia triacanthos)

766 La Para Avenue, center front yard next to the driveway

This deciduous tree is native to the eastern U.S. and is widely planted there as a street tree. They grow to 35–50' with a similar spread. Their fine leaflets produce dappled shade and little raking is needed. Unfortunately, they have proven to be poor performers in Palo Alto.

11. Valley Oak (Quercus lobata)

719 La Para Avenue, right of the driveway and right of the sidewalk

These two younger trees may reach a height of 70' or more, with an equal spread. Planted about 1960, these trees illustrate how a Valley Oak planted today will grow and develop over time. The acorns from Valley Oaks were a favored food of California Native American tribes, who leached out the tannic acid and found a nut with lots of carbohydrates and little fat.

12. California Pepper Tree (Schinus molle)

3925 La Donna Avenue, 2 trees center and right front

A native of Peru, this fast-growing evergreen tree can reach 40' with an equal spread. Its weeping canopy contains bright green, narrow leaflets and many yellowish-white summer flowers in drooping 4–6" clusters. The flowers become rose-colored berries in the fall. It was introduced to California by Europeans and is a characteristic tree of the California mission gardens.

13. Bigleaf Maple (Acer macrophyllum)

3880 La Donna Avenue, left of the driveway on San Jude Avenue

Native to California, these broad topped, dense, deciduous trees do well as street trees in areas with deep soil. They grow 30–50' tall. Notice the large, dark green leaves on this tree and the lightly-furrowed gray bark. They grow quickly to form a symmetrical, rounded canopy. This specimen is thriving on the extra irrigation from the lawn. These trees are adaptable; they can also grow well in a low-irrigation area.

14. Tulip Tree (Liriodendron tulipifera)

3852 La Donna Avenue, 2 trees on San Jude Avenue

The Tulip Tree is the tallest-growing broad-leaved native to North America. Its distinctive leaves turn butter yellow before dropping off in the fall. Light green tulip-shaped flowers borne in the summer are hidden high in trees 12 years old and older. Tulip Trees often drop sticky sap due to aphid infestation common in our climate zone. These trees are healthier with regular watering.

15. American Elm (Ulmus americana)

3842 La Donna Avenue, 2 trees

Native to the eastern U.S. and Texas, this deciduous tree has toothed leaves that are 3–6" long. These lovely large trees have so far escaped Dutch Elm disease and the pests that have decimated the American Elm population in this country.

16. Raywood Ash (Fraxinus angustifolia ssp. oxycarpa 'Raywood')

720 Paul Avenue, center front yard

This round-headed medium-sized tree is distinctive in the purple-red colors it displays in fall. It is a fast-growing tree that will take on a difficult environment. However, with its susceptibility to branch failure (dropping branches), root problems, and various diseases, the City of Palo Alto no longer plants the Raywood Ash as a street tree.

17. White Birch (Betula pendula)

750 Paul Avenue, cluster of trees in the left front corner

This species from Northern Europe has graceful weeping branches. It is deciduous and wind-pollinated. Its minute flowers are borne in cone-like structures that break apart when mature, releasing many tiny winged fruits. The white bark cracks to form black fissures on the oldest parts of the truck. It is a very thirsty tree.

18. Western Sycamore (Platanus racemosa)

768 Paul Avenue, right front corner

Native to stream banks in Santa Clara County and elsewhere in California in canyons up to elevations of 4,000'. Stalks of 3–5 1" seed balls are apparent after leaves drop in the fall. By the time the seed balls litter the street, the light-weight seeds in the seed balls have already been forced out into the air.

19. Dawn Redwood (Metasequoia glyptostroboides)

769 Paul Avenue, right of the driveway

Young Dawn Redwoods grow very fast, sometimes 4–6' a year, ultimately reaching a height of 80–90'. The needles are lighter green and softer to the touch than those of the Coast Redwood. In the fall, they turn brown and drop off completely. It is rare for Dawn Redwood seeds to sprout; trees such as this one are grown from cuttings.

20. Canary Island Pine (Pinus canariensis)

3737 El Centro Street, row of 4 trees in front

A drought-tolerant tree, Canary Island Pine grows fast into a pyramidal shape. Needles grow in bundles of 3 and are 9–12" long. A distinguishing characteristic of this pine is the needle growth. New needles point upwards and old needles downwards.

21. Pecan (Carya illinoinensis)

3675 La Calle Court, at the corner of Barron Avenue

Native to the south-central U.S., this fast-growing deciduous nut tree can attain 70' with a spreading canopy. Edible nuts from Pecan trees are a rarity in our climate; although the trees will sometimes set nuts, summer temperatures are not high enough for the nuts to harden.

22. Mosaic Tree

3680 La Calle Court, left side of the front yard near the street

Not a tree at all, but an artist's representation of a tree. Created by Palo Alto artist Christine Heegaard and called Lives, it represents a tree in all seasons that grows all fruits and gives shade, shelter, oxygen, and colors.

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Trees protected by the City of Palo Alto tree ordinance

A permit is needed to remove or prune these trees.

Check the City of Palo Alto Tree Regulations.

Trees with low watering needs

These trees are best adapted to our climate and water availability.

Thirsty trees

These trees require frequent summer irrigation and will suffer from the drought cycle in our area.

Do not plant unless you are aware of a water source such as high water table or creek proximity.

Trees not recommended for planting

These trees are either invasive, do not perform well or create infrastructure or other problems.