Cloning with a leaf?

The other day i was moving up my lights, when one fell dangerously close to a plant...after messing around some more, when i was finally done, i noticed that a leaf had been damaged and had fallen off the plant...i have this leaf in a cup of water, and am just curious to kno if it will sprout roots? If so, when will i start to see something happen?

a leaf of a marajuana plant wont grow roots....there are some plants that you can propagate from a leaf but not mull plants ...sory dude.....

lucky is right... you need a stem with at least 3-4 nodes in order to clone

thanks guys...