When something suberises, it develops or becomes covered in cork.
Suberising is a natural process that happens to some plants.
Examples:
The tree suberises as it gets older.
The cork suberises over time.
The plant suberises to protect itself from the weather.
The cork suberises and becomes bumpy.
Over many years, the tree suberises and becomes very strong.
The plant suberises and looks different than before.