Hikers in Russian Ridge Open Space Preserve / photo by Lanette Otvos

What's That Weed?

Sunday, June 22, 2025
9:00 am - 12:00 pm
Thornewood Preserve
Approximate Total Miles
3

French broom, Harding grass, star thistle, Acacia….. The list of non-native, invasive weeds in Midpen preserves goes on and on. But what exactly is a weed? Join Docent Naturalists Frances Reneau and Helena Cohen on a moderately-paced hike along the Schilling Lake and Bridle trails to learn to identify some common local weeds and discover the attributes that make them so difficult to eradicate.

Where to Meet

Meet at the Thornewood Parking Area on La Honda Road. From I-280, take the Highway 84/Woodside Road exit. Follow Highway 84/Woodside Road through Woodside and then to a junction with Portola Road at 3.3. miles. Bear right to stay on Highway 84, now La Honda Road. At 4.9 miles from Highway 280, turn left at a brick wall marked 895-897; look for the Midpen sign just inside this gate. The small parking area is on the right about 500 feet from the entrance gate. Please do not drive beyond this lot toward the private residences.

Alternatively, from the junction of Highway 35 (Skyline Boulevard) and Highway 84 in Sky Londa, take Highway 84/La Honda Road north 1.9 miles and turn right at the brick wall marked 895-897.

To ensure your experience on a docent naturalist outing is enjoyable please review these activity guidelines.

For more information about trail characteristics for this event, check out the Midpen Trail Explorer app. To learn more about ADA accommodations for events, or make an inquiry with the ADA coordinator, visit our Accessibility page.

If your activity requires registration, please be sure to cancel your reservation (from your confirmation email) if you are no longer able to attend so others can participate.

After your participation on a guided activity please share your feedback — your input is meaningful to our volunteers and program staff – thank you!