Silencing a gene called GA 2-oxidase in tobacco plants can make them grow taller and produce more fiber. This gene usually limits the effects of a growth hormone called gibberellin, but when it's silenced, the plants can accumulate more of this hormone and grow better. The silenced plants had more xylem fiber cells than plants with another gene overexpressed. Combining the two genes didn't have extra benefits. This discovery could help improve growth and fiber production in tobacco plants, which could be useful for industries that use plant fibers.