The American Society of Landscape Architects defines landscape architecture as the "...profession which applies artistic and scientific principles to the research, planning, design and management of both natural and built environments. Practioners of this profession apply creative and technical skills and scientific, cultural and political know-ledge in the planned arrangement of natural and constructed elements on the land with a concern for the stewardship and conservation of natural, constructed and human resources. The resulting environments shall serve useful, aesthetic, safe and enjoyable purposes."

"Landscape architecture may, for the purposes of landscape preservation, development and enhancement, include: investigation, selection, and allocation of land and water resources for appropriate use; feasibility studies; formulation of graphic and written criteria to govern the planning and design of land construction programs; preparation, review, and analysis of master plans for land use and development; production of overall site plans, landscape grading and landscape drainage plans, irrigation plants, planting plans, and construction details; specifications; cost estimates and reports for land development; collaboration in the design of roads, bridges, and structures with respect to the functional and aesthetic requirements of the areas on which they are to be placed; negotiation and arrangement for execution of land area projects; field observation and inspection of land area construction, restoration, and maintenance." (from: 1993 Members Handbook, pg. 2)

Landscape architects and permaculturists share an interest in the design of landscapes including the relative location of elements, concerns for movement of water on the site, and use of plants. Landscape architects also use a design process as a means to consider natural and cultural forces influencing design decisions. Permaculture, in general, is more specific in its statement of principles and its design and selection of plants for useful, productive and sustainable ends. Individual landscape architects may, however, approach design from a permaculture perspective while others see the landscape as a functional, decorative and aesthetic entity.
Permaculturists should be aware of at least these three references written by landscape Architects:
Lyle, John T. 1994. Regenerative Design for Sustainable Development. New York: John Wiley & Sons. 

McHarg, Ian. 1969. Design with Nature. Garden City, New York: Natural History Press. (available in new edition as well)

Thayer, Robert L. Jr.. 1994. Gray World, Green Heart; Technology, Nature, and the Sustainable Landscape. New York: John Wiley & Sons. 
 Examples of Landscape Architecture at HOME, COMMUNITY, and REGIONAL scales.
from: Laurie, Michael. 1975. An Introduction to Landscape Architecture, Elsevier. pg. 46,73,105.

Landscape Architecture