A Website about Urban Environmental Restoration in Fairmount Park, Philadelphia
Sanguinaria canadensis
Covering the hillsides on the upper trail behind Valley Green. This was on Saturday, April 6th. Â We found some being crowded by lesser Celandine, which we pulled up around the plants, as illustrated below.
The amazing volunteer crew worked hard and smart and created great signage making the experience interesting and enjoyable for visitors. The inclined trails were covered in pine straw reducing slipping hazards and giving them a luxurious appearance. the lower trail has become too muddy with all the rain and has been roped off. There has been a lot of attention paid to the many species of trees, shrubs, vines, orchids and wildflowers on the preserve. Owls could be heard hooting as well as peeping frogs. You may want to bring a magnifying lens to get a great view of the blooming orchids and to see the trout lilies up close. They come in many unique shapes!
Please try to be careful and not trample the flowers!
There was some decent variation of the species on site, here is a pink variety. We also saw some pale  blue specimens. 
Lesser celandine was the most annoying invasive covering much of the area most likely previously inhabited by Mertensia at this time of the year. We tried to not let this bother us too much as we were here to enjoy a happy spring day.
As you can see here, the trail is very inviting and also very long, which is why we chose bicycling. There are benches all along that one can stop at to enjoy the view.
 
Here you can see the Lesser Celandine taking over. If local residents and volunteers could adopt a small, doable section and hand pulled these, maybe it could help mitigate the problem. 
Here is a pale blue variety!Â