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Welcome to The Thielke Arboretum, Glen Rock, New Jersey!

The Garden in Your Backyard

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ARTboretum 2017
Weed Warrior Day 2017
Nature Journaling 2017
Fishing Derby 2017
Bugs in the Brook
Bird Watching 2017
Spring StoryWalk 2017
Winter Journey Sticks Wal
Bark ID Workshop
Winter StoryWalk
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The Language of Bark

A Local Winter Bark ID Workshop

Love to be out in nature, among the trees, no matter the season?  

Yes, the leaves are gone, but trees in winter have their very own unique language. They tell us their ID through their bark in very specific ways. Join us at the Thielke/Glen Rock Arboretum, 460 Doremus Ave., Glen Rock, on February 18, (Raindate: February 19), from 12:30 to 2:00 PM, for an informative, interactive workshop on Bark Identification.  

Cost is $10 members, $12 non-members.  

This workshop is for adults and teens, but children are always welcome, accompanied by an adult.  

Register For this Class online HERE.


Join our expert, Ms. Jean Epiphan, and learn to unravel the mysteries of the bark patterns, texture, feel, color, and even sometimes the smell to ID the trees.  She has a rich and varied background in her relationship with nature.  Jeannie has held positions as a perennial gardener, forest ranger, arborist, landscape designer, field biologist, and is currently a Rutger's staff ecologist in the Department of Evolution, Ecology, and Natural Resources. In addition, Jeannie still finds time to volunteer her time and expertise to various local non-profit groups in Ridgewood and Glen Rock.  She is currently the volunteer Land Manager for the Thielke Arboretum, where she uses her skills to carefully maintain, protect, and enhance the ecology of the arboretum.

Have a question for Ms. Epiphan?  Come to her veryinformative 

Winter Bark ID Workshop on Saturday, February 18th, and/or come volunteer any Saturday.  Ms. Epiphan is onsite teaching other volunteers, while volunteering herself. 

To learn more about us, check out our other activities at or visit us on Facebook. 

Membership and donation forms are always available on the website. 

The Thielke/Glen Rock Arboretum is run strictly by the volunteer members of The Friends of the Glen Rock Arboretum, Inc, and is a non-profit 501c3 organization.