Dandelions were brought by the earliest settlers to the Pacific Northwest, as food and medicinal plants for gardens. They escaped.
Earthworms were also brought by European settlers. Curiously, settler culture now encourages worms, on the grounds that they are natural to building soil, which isn’t so, yet spray dandelions with toxins, on the grounds that they spread terribly. They do spread into perfect, green lawns, that’s true, and onto road margins, like the one above, and pastures, orchards and hayfields, but that’s not a reason for poison. Sadly, the “reason” for poisoning them is that they make claims to perfect private ownership and control of the land. Earthworms just make more of it. This is what it is like to live in a class society, and a racist one, always with its eyes on its roots in slavery.