Sahara Mustard Removal on the Sycamore Canyon Trail

The Friends of the Wilderness Park held their first ever invasive plant removal event on Saturday, January 28, when a dedicated group of volunteers, including members of Boy Scout Troop 407, removed Sahara Mustard from the Sycamore Canyon Trail.

Sahara Mustard has done horrible damage to the desert east of her, displacing native wildflowers and other native plants as well as creating a fire hazard where none had existed previously. Fortunately, Sahara Mustard has only established a few relatively small infestations in the Wilderness Park, so we have an excellent chance of eradicating this pest.

Two of the infestations are along the Sycamore Canyon Trail – one at the bottom of the trail and one about one-third of the way up. Although you always miss some, we tried to remove all of the mustard in both of those areas, and we filled 15 contractor bags full of mustard! It will take a few years before all the mustard is gone, as a seed bank has already been established, but we hope to see progress soon!

We hope to be having invasive plant removal events about once a month except for the hot part of the summer. If you’d like to get an announcement, just sign up for our email list.

Here are some photos from the mustard removal:

Scenes from Second Saturday

December 8 was a lovely, clear day for the Second Saturday program. Here are a few scenes, including the greeters and trash picker-uppers, a thirsty dog, a tarantula, and a new invasive plant – Brassica fruticulosa (Mediterranean Cabbage or Twiggy Turnip).

Invasive plant mapping underway

The Friends are currently mapping invasive plants in the Claremont Hills Wilderness Park, and Saturday morning we mapped invasives along the first section of the Cobal Canyon Trail.  This is what the resulting map on CalFlora looks like:

Invasive plants Cobal Canyon

If you go the actual CalFlora page, you can click on a dot and see details of each observation, including photos and number of plants.  There are a lot of invasive plants along the Cobal Canyon trail, and in fact the Master Plan noted that Cobal Canyon had the highest number of different invasive species.

If you would like to help with the mapping effort, please contact us at, and we’ll contact you to sign you up for instruction and mapping.