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

The Garden in Your Backyard

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Nature Journaling 2017
Fishing Derby 2017
Bugs in the Brook
Bird Watching 2017
Weed Warrior Day 2017
Spring StoryWalk 2017
Winter Journey Sticks Wal
Bark ID Workshop
Winter StoryWalk
Summer StoryWalk
Fall StoryWalk

We need your help!  

On Sunday, April 2, 2017 from 10:00 AM to 1:00 PM, for our seasonal Weed Warrior Day stewardship project.  Can't tell one weed from another?  Don't worry; we've got you covered.  Learn from the experts!  Our own local expert, Elaine Silverstein, along with other knowledgeable volunteers, will be on hand to share their wisdom about these and other invasive plants that may be homesteading on your own property.  

No experience is necessary.  Wear boots, and dress according to the temperature.  Bring gloves, kneelers, pruners, and drinking water.  We will have extras on site if you don't have them.  

Spring is officially here!  Bring your family and friends and get outdoors and enjoy nature.  The Arboretum is public land.  It belongs to all of you!  Come help take care of it for your enjoyment and for future generations. Spend as little or as much time as you can with us. In the event of rain, our rain date is Sunday, April 23rd from 1:00 to 4:00 PM.  Please note the time change. 


We appreciate your interest in helping to maintain and restore this vital freshwater wetlands and forest habitat.  See you at the Arb!