A gardening box is disclosed. The gardening box may include a main body having a receiving space a separation board having a plurality of through holes to secure water absorbing units and dividing said receiving space into an upper space and a bottom space a plurality of observing holes located at a lower portion outside the main body and a plurality of water absorbing unit secured at the separation board, and a lower portion of the water absorbing unit exposes at the bottom space to absorb water from the bottom space to moisturize soil and plants thereabove. Water level can be observed from the observing holes because the water level of the bottom space is identical to the observing holes according to the law of communicating vases.
