Yes, in the garden at least, not all volunteers are good guys.
Among the nasties in my garden are crabgrass, some kind of fine-leafed bindweed, dandelions and, by far the most persistent, galinsoga (an invasive from Europe that emigrated to my garden 30 years ago and has no intention of leaving).
Among the good volunteers of summer: dill and cilantro.
Oh, and I have almost too much calendula, also known as “pot marigold,” which I don’t use for cooking but which produces bright and beautiful yellow and orange blossoms all summer.
Now, tell me about the volunteers in your garden: good and bad.