I have a Amazon Sword that has a 6"stem growing with new leaves at the end. The leaves are about 2" long. Is there a way to cut this off and re-plant it, or should I just leave it?
You could cut it off and let it float, new roots should form within a week or two if all is well..or simply let it go...plants have a funny of moving all on there own
Where exactly should it be cut? I'd like to plant it in the gravel, but I guess it needs roots before I do this? Will it grow roots eventually if I don't cut it?
Yes, it will form roots if you leave it on the stem. Just leave the plantlet on the stem until it forms lots of roots, and it should fall off by itself, but if it doesn't after a while, just cut it as close to the plantlet as you can. Then you can plant it.
I agree with guppygirl, wait until the plantlet forms lots of roots before cutting it off. I did this with mine, waited until there was a huge mass of roots, and it is now growing very nicely. My fish really seemed to like the tangle of roots.