| MadSci Network: Botany |
Part of the reason why you have not been able to find geotropism websites may be that geotropism is an obsolete term. The preferred term is now gravitropism and there are several websites devoted to gravitropism. It is an important plant response on Earth and it is of great concern for growing plants in the space station, where gravity is lacking. References: The Gravitropism Database Gravitropism Wisconsin Fast Plants Gravitropism Experiment
Try the links in the MadSci Library for more information on Botany.