If a person is responsible for taking care of their favorite rose bush, that rose bush's fate, its liveliness, and its health now has a causality associated with that person. If it thrives, it was the responsibility of that person and can be attributed to that person's actions. If it dies, the responsibility also lies with that person.
This does necessarily mean that if the rose bush dies, the person will have to explain how or why the rose bush died. Responsibility merely says that blame (or praise) is assigned for whatever happens to the rosebush to one person, or a group of people. If the rose bush dies, it is the fault of that person or group, but they do not owe any explanation of how or why it happened.