It is interesting that in reading the questions and answers in this forum, I have not seen anything about taking a leaf of the Sansevieria and just placing it in water to start the new roots. I have done this for years. When a leaf is broken, I just stick it in a flower vase with water and after the roots are established I plant it in the soil. Is this an unusual happening? Some times I just leave the leaf in the vase and it has lasted for years like that. Now, I must confess also, I am the worlds worst at watering plants. Even those in the vases can go without having water for long periods of time at my house.