Invasive plants (i.e. weeds) have been on the upswing lately as a threat to take over desirable plants, out-compete farm crops, and disturb the fragile health of ecosystems.

Invasive species can wreak havoc wherever they're found, but Florida has a few that are particularly dangerous. Here are the most threatening of them.

Often planted as ornamental trees in yards and parks, Callery/Bradford pear trees became popular because they were pretty, grew to a mid-size ... instead of the invasive species, flowering ...