Someone told me just to put a little water over the roots of my bamboo plants or it will rot?

If this is what they call Lucky Japanese Bamboo, yes the roots must stay submerged in water at all times. Cange the water about once a month and rinse off the roots. I have several in vases with marbles holding them up and water covering the roots...........########

I do not have a green thumb, dear Shall . . I'd be afraid to give you any advice toward the care. of any plant. I'm sorry!