How do the plants change after the town changes in Silent Spring by Rachel Carson?

The book Silent Spring by environmentalist Rachel Carson sounded the alarm to the consequences of pesticides, fertilizers, and other chemicals that were being used for things like pest control in agriculture. As part of her book, Carson examines the way people's actions contributed to a change in plant life.
One way she shows this is by describing the ways plants were mutating or being destroyed altogether when a town changed. For example, a town might start using a particular type of pesticide on their farms, and that could lead to mutations in crops or other plants that were nearby and accidentally received part of the pesticide. We see this problem today: weeds are mutating to become resistant to different types of weed killers, ironically becoming stronger because of a chemical that is supposed to kill them.
Even today, we can expect that as a town changes— for example, relying on more chemicals for farming or having industries that produce certain types of pollution—the nearby plants will change, too.