1.   As the topsoil dries out, the roots continue growing downward as they follow their underground water source.

2.   If not removed early, cancer cells may grow downward from the skin surface, invading healthy tissue.

3.   Q. Recently I purchased a weeping cherry and find it strange that the limbs really do grow downward, not up toward the sun like other plants.

4.   Water the lawn deeply to encourage roots to grow downward.