What method did Aristotle use to classify plants?

Since the dawn of civilisation, there have been many attempts to classifyliving organisms. It was done instinctively not using criteria that werescientific but borne out of a need to use organisms for our own use – forfood, shelter and clothing. Aristotle was the earliest to attempt a morescientific basis for classification. He used simple morphological charactersto classify plants into trees, shrubs and herbs. He also divided animalsinto two groups, those which had red blood and those that did not.