Stop and smell the roses
...Buoyancy-driven convection is eliminated in microgravity, and this may alter the physiology of plants, resulting in the production of the fragrance not produced by the same plants on Earth. http://www.iff.com/Internet.nsf/0/FF00057F4AA7ADCF85256BFF000A1BC9
...Astronauts aboard space shuttle Columbia are performing experiments on how plant fragrances change in space. Tests on previous missions showed that the essential oil of a rose morphed into a new scent in microgravity. Oils extracted from a rose launched in 1998 aboard space shuttle Discovery lead to the creation of a new scent that has been incorporated into a perfume called Zen by Shiseido. http://www.boingboing.net/2003/01/23/heaven-scent-do-rose.html
...The rose plant was sent into the space for 9 days. While the flower was blooming in space, it was analyzed over four consecutive days. The comparative results of the space rose and the Earth rose showed a drastic difference in their fragrance molecules. http://idb.exst.jaxa.jp/edata/02497/pdf/STJ85-11.pdf