Del. Code Ann. tit. 24, § 201
The following words, terms and phrases, when used in this chapter, shall have the meaning ascribed to them except where the context clearly indicates a different meaning:
(3) a. “Landscape architecture” shall mean any service or creative work the adequate performance of which requires landscape architectural education, training and experience. It shall mean the performance of professional services such as consultation, investigation, research, planning, design, preparation of drawings, specifications and contract documents, and responsible supervision or construction management in connection with the development of land areas where, and to the extent that the dominant purpose of such services is: The preservation, enhancement or determination of proper land uses, natural land features, wetlands and environmentally sensitive plant and animal communities, naturalistic and aesthetic values; the determination of settings, circulation systems, and hard scaping structures, grounds and approaches for buildings and structures or other improvements; the determination of environmental problems of land relating to erosion, flooding, blight and other hazards; the shaping and contouring of land and water forms; the setting of grades, determination of drainage and providing for storm drainage systems where such systems do not require structural design of system components and determination of landscape irrigation.
60 Del. Laws, c. 190, § 1; 67 Del. Laws, c. 385, § 1; 70 Del. Laws, c. 186, § 1; 74 Del. Laws, c. 262, § 5; 74 Del. Laws, c. 336, § 1