Seagrasses grow by extending a rhizome -- that is a subterranean stem that elongates at rates of about one centimeter to about five meters per year, and they branch and extend along the seafloor, forming large clones.

海草通过根茎的生长而生长——根茎是一种地下茎，以每年约一厘米至约五米的速度伸长，它们分枝并沿着海底延伸，形成大型克隆。