What makes a species local, indigenous, alien, invasive, naturalized, or imported to a specific ecology ?How do species, including humans, root in places they are not originally from? I reflect about an invasive specie, the blu crab that over-populates the Lagoon. Reminding us about the colonial history that brought corn from the Americas, I considered the meaning of becoming “naturalized” to local ecologies. I complete by using spontaneous plants that reconnects to the tidal of Venice, halophytes.