But for modern english speakers,I would used the word 'wild'.1.
existing in a natural state, as animals or plants; not domesticated or cultivated; wild.
Feral can have other connatations;
1. (Life Sciences & Allied Applications / Biology) Also ferine (of animals and plants) existing in a wild or uncultivated state, esp after being domestic or cultivated
2. Also ferine savage; brutal
3. Austral derogatory slang (of a person) tending to be interested in environmental issues and having a rugged, unkempt appearance
n
1. Austral derogatory slang a person who displays such tendencies and appearance
2. Austral slang disgusting
3. Austral slang excellent
[from Medieval Latin ferālis, from Latin fera a wild beast, from ferus savage]
ferity [ˈfɛrɪtɪ] n