PURPOSE: To simply form the ground to grow plants over a wide area by a method in which many holes of given depths for vegetation are excavated at intervals in the sloped ground by jetting high-pressure water, and a greens- planting material composed of replaced soil, fertilizers, etc., is packed into the holes.

CONSTITUTION: Holes 2 of comparatively small diameters for vegetation are formed at equal intervals in the sloped ground 1 by jetting high-pressure water from a nozzle. The diameter and depth of the holes 2 are properly selected according to the properties of the ground and the species of plants. After the excavation, a greens-planting material 3 prepared by mixing replaced soil with fertilizers, fibrous materials, etc., is packed into the holes 2. The ground to grow plants can thus be very simply formed in the sloped ground with good efficiency, and the strength of the surrounding ground can be maintained without degradation.