Don’t gather flowers by the roadside.
The same goes for railroad tracks and trails where dog walkers frequent. There may be petrochemicals and other toxic compounds from vehicles, as well as contamination with bacteria and other pathogens from animal manure. Don’t eat flowers purchased at roadside stands, farmers markets, garden centers, or florists, which may contain pesticides. Eat only flowers that are explicitly labeled as edible. Gourmet grocers often sell edible flowers, or you can grow your own at home, taking care to choose the right types and grow them right.