Full Idea
There is a critical line to be drawn between those entities whose active source of maintenance is internal and those whose source is external. This is the chief line that Aristotle draws between organisms and artefacts.
Gist of Idea
The hallmark of an artefact is that its active source of maintenance is external
Source
report of Aristotle (Metaphysics [c.324 BCE], ess) by Mary Louise Gill - Aristotle on Substance Ch.7
Book Reference
Gill,Mary Louise: 'Aristotle on Substance: Paradox of Unity' [Princeton 1989], p.213
A Reaction
Plants need water and sunlight, so I'm not sure that this marks the line quite clearly enough.