Please be aware that many national, state, and local parks have restrictions
about gathering so much as a leaf. I would hate to see anyone incur a hefty
fine for unknowingly breaking a park regulation.
In the same vein, please consider scattering seed to help the plants
continue. You could even buy seed from one of the "wild" nurseries, and add
plants you like to the places where you forage.
Just a thought.
Diana in Cincinnati