To quickly and precisely realize an optimal plant cultivating plan by combining various functions possessed by greening and growth conditions of plants.

This greening retrieval system has a retrieval means for retrieving a plant required for the optimal plant cultivating plan on the basis of a plant database, and an output means for displaying and outputting a retrieval result. The result database is composed of respective databases of a landscape gardening plant material, a dieting tree, a small plant, an atmosphere purifying plant, an indoor greening plant, a toxic plant, an allelopathy plant, and a red list. In addition to a general characteristic of the plants such as at leas a plant name, an aptitude for growth in accordance with the climate, the existence of the aroma, a fortune-telling degree, a growth characteristic, smoke resistance, tide resistance, and a dryness and moisture characteristic, a functional characteristic of the plants such as a dieting tree kind in accordance with birds, atmosphere purifying capacity, toxic kind, an allelopathy emanating kind, an allelopathy influential kind, and a red data recording kind is inputted to a landscape gardening plan material database.