To prepare plots of land for architectural horticulture and to provide decorative treatment and arrangement of gardens, lawns, shrubs, vines, bushes, trees, and other decorative vegetation; construct conservatories, hot and green houses, drainage and sprinkler systems, all types of rockspacing and ornamental pools, fountains, ornamental walls, fences, and walks; and placement of hydro mulching for ground cover and for containment of soil, to include installation of irrigation control electrical wiring that will carry 24 volts or less.