Slideshow: Simpsons Plant Seeds of Invention

credit Courtesy of Rob Baur
Growing the plants side by side, Rob Baur cut their stems open and wrapped them together. When the plants fused, he severed the tomato root, leaving the tobacco root intact.

credit Courtesy of Rob Baur
By growing tomato and tobacco plants from seed and grafting them together, Rob Baur created a tomato plant with tobacco roots. The leaves and fruit of the tomato top have nicotine in them.