PROBLEM TO BE SOLVED: To provide a plant growth unit which uses a water absorptive tabular structure to be capable of easily and simply growing plants, and a plant growth method using the same.SOLUTION: A plant growth unit comprises: a container 1 which can store water or hold moisture; and a plurality of tabular structures 2. The tabular structure 2 has water absorptive property and the plurality of tabular structures sandwich a root of a plant body to form a space 3.