Purdue University has a course called, "The History of Horticulture" taught by Jules Janick of the Department of Horticulture and Landscape Architecture. A video and PowerPoint slide program of all 42 lectures are available online.

You can view the video links in a media browser.The resolution is OK. Because image resolution is much better in the PowerPoint files the best way to view the lectures is to open the PowerPoint file (under "Course Content"), then open the video file and watch it as you follow along.

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