• Skip to primary navigation
  • Skip to main content
  • Skip to primary sidebar

The Glen Park Association

Up-to-the-minute news from Glen Park

  • Home
  • Glen Park Association
    • About the Glen Park Association
    • Join the GPA
    • GPA Board Contacts
    • GPA Meeting Minutes
    • Bylaws
    • Neighborhood boundaries
  • News Stories
    • Glen Park News
    • Editor’s Picks
  • Greenway
    • About
    • Greenway Plan
  • GPA Grants Program
  • Crime & Safety
  • Contact
    • Contact
    • Volunteer Sign Ups
    • Event Submission
    • Author Submissions

The Greenway oak woodland is growing! Goodbye wire cages

May 24, 2021 by Nicholas Dewar, Greenway Project

The California oak woodland on the Glen Park Greenway is reaching new heights and the time has come for most of the young trees to be freed from their protective wire cages.

Each year, mainly during the month of March, coast live oaks like the ones planted along the Greenway put on a growth spurt. Astonishingly, about 90% of the annual increase in height happens in a single month! So we measure the trees every May to see how they’ve grown. As shown in the attached graph, the median height of the trees, planted as acorns in December 2017, is now about 32”. But some are doing much better than others: the tallest has now passed five feet while the shortest has reached only one foot! To support the trees that appear to be struggling, we will water them every four weeks through this summer. Let’s hope that the shorter ones can catch up.

Now that the trees are three years old they have started to produce lateral roots that grow horizontally outwards. These lateral roots pass through the mesh of the wire cages that have protected them since they were first planted. So this winter we removed the cages of all but the few trees that are developing most slowly. The trees without their protective cages, that extend at least six inches underground, now run the risk that a gopher or other creature will destroy their roots. However, this risk is offset by the greater danger that the trees would be severely damaged if removal of the cages were delayed until their lateral root system were much more developed.

You can admire the coast live oaks along the Greenway between Lippard and Burnside Avenues. They’re recognizable because each one is protected by a pale green plastic tube “tree-shelter”.

Acorns are sown in protective cages

After a tree sprouts from the acorn, the top of the cage is
opened and a tree shelter is secured over the seedling.

 

After two or three years the tree has emerged from
the tree shelter and the wire cage is carefully removed

 

 

Filed Under: Greenway, Uncategorized

Primary Sidebar

IMPORTANT UPCOMING DATES

Upper Noe Neighbors Community Meeting Wednesday, May 21, 7 p.m.
Upper Noe Recreation Center auditorium
295 Day Street
Agenda


San Francisco Department of Public Works logoDPW Love Our City
District 8 Cleanup Day
Saturday, June 7, 9 a.m. to afternoon
Learn more and sign up here


 

Logo Center for Creative Exploration

The Center for Creative Exploration
Explore all the Colors of the Rainbow
one-day workshop
Saturday, June 7, 10 a.m. to 4 p.m.
300 Chenery Street
Learn more and link to registration here


Weeding Party
June 21, 10 a.m. to noon
100 block of Arlington at Charles
Join neighbors on the North end of the Cut to keep down the weeds and beautify top to bottom. Tools, lunch and good company provided.


Stop the bleed logoStop the Bleed Workshop
Thursday, June 26, 6-9 p.m.
St. Aidan’s Church
To learn more, click here


Monthly cleanup on the Greenway
First Saturday of the Month (usually)
Click here to learn more


Friends of Glen Canyon’s
Glen Canyon Habitat Restoration
Every third Saturday 9:30 a.m to noon
Sign up here

Subscribe to this Newsletter

Sign Up for Glen Park Association News Updates:

* indicates required

Check It Out at the Glen Park Library

Click the above button or here to see all upcoming Glen Park Branch Library events. Subscribe to our monthly newsletter to get events highlights in your inbox.

Glen Park Rec Center

Glen Canyon Park sign
Click here for latest
Glen Park Rec Center
class schedule


Saturdays 3-4:45 p.m.
Questions? Call 415-239-4007


GP Movie Night Schedule

Renew Your Glen Park Association Membership for 2025

Join the Glen Park Association and help promote our community’s interests. Together, we can secure improvement funds, publicize neighborhood concerns and strive to speak as one voice on neighborhood and city issues.

Membership in the Glen Park Association is only $10 annually and can be purchased online.

Glen Park Association Advertising Sponsors

JE_Digital Small Space Ad
Diamond Heights Digital Ad
GPA Ad- Perez Construction ad 6.27.22 v Glen Park
moroco
Center for Creative Exploration - adult
JE_Digital Small Space Ad
Diamond Heights Digital Ad
GPA Ad- Perez Construction ad 6.27.22 v Glen Park
moroco
Center for Creative Exploration - adult
previous arrow
next arrow
Shadow

Current Weather & Air Quality

Glen Park featured on…

FacebookSF ChronInstagramTwitter

Join the Glen Park Association on Facebook

Comments Box SVG iconsUsed for the like, share, comment, and reaction icons
Glen Park Association is at San Francisco Public Library Glen Park Branch.
2 days ago
Glen Park Association

Photos and Fun courtesy of the Glen Park Library!
It was a great turnout at the Glen Park Library Open House on Saturday May 17th!

Thank you to all who attended and a big thank you to Glen Park Branch Library Manager Darren Heiber and his staff for a fantastic day!! 🙌🏽

San Francisco Public Library Arion Press | Artist Books Museum of Craft and Design Rafael Mandelman 🏳️‍🌈 #glenparklibrary #arionpress #museumofcraftanddesign #glenparksf #sanfrancisco #InCommunity
... See MoreSee Less

Photos and Fun courtesy of the Glen Park Library! 
It was a great turnout at the Glen Park Library Open House on Saturday May 17th!

Thank you to all who attended and a big thank you to Glen Park Branch Library Manager Darren Heiber and his staff for a fantastic day!! 🙌🏽

@sfpubliclibrary @arionpress @museumofcraftanddesign @rafaelmandelmand8 #glenparklibrary #arionpress #museumofcraftanddesign #glenparksf #sanfrancisco #incommunity
View on Facebook
· Share
Share on Facebook Share on Twitter Share on Linked In Share by Email
View Comments
  • likes 0
  • Shares: 0
  • Comments: 0

0 CommentsComment on Facebook

Glen Park Association is at Glen Park Recreation Center.
3 days ago
Glen Park Association

Qi Gong & Tai Chi Thursdays at the Glen Park Rec Center!

Thursdays 2:00PM - 2:45PM
Room #1
Led by led by Ashima Sarin

Beginners and All Levels of Mobility Are Welcome! It’s FREE and drop-in!

(There will be no class the second half of June and July)

📍Glen Park Rec Center, 70 Elk Street

QUESTIONS? CALL 415-239-4007
... See MoreSee Less

Qi Gong & Tai Chi Thursdays at the Glen Park Rec Center!

Thursdays  2:00PM - 2:45PM 
Room #1
Led by led by Ashima Sarin

Beginners and All Levels of Mobility Are Welcome! It’s FREE and drop-in! 

(There will be no class the second half of June and July)

📍Glen Park Rec Center, 70 Elk Street 

QUESTIONS? CALL 415-239-4007
View on Facebook
· Share
Share on Facebook Share on Twitter Share on Linked In Share by Email
View Comments
  • likes 4
  • Shares: 0
  • Comments: 0

0 CommentsComment on Facebook

Blog Roll

Coyote Yipps
Friends of Upper Noe Recreation Center
Glen Park Neighborhoods History Project
Open SF History
Sunnyside Conservatory
Sunnyside History
Sunnyside Neighborhood Association
Tramps of San Francisco
Upper Noe Neighbors

Copyright © 2025 · Metro Pro on Genesis Framework · WordPress · Log in