The LI's new Royal Charter, which had to be given the green light by Privy Council, the organisation which runs the scheme, came into effect on 1 September.
It includes changing the designation of chartered professional members from Member of the LI (MLI) to Chartered Member of the LI (CMLI).
Professional trainees will now be known as Licentiates, rather than Associates. New academic membership grades will be open to those who contribute to the profession through teaching and research, with two academic grades - Academic Member and Academic Fellow.
Affiliate membership is open to people working in related professions or areas of expertise, who have an interest in landscape and the environment, who would like to join the landscape community and get the benefits of the LI's services.
"This new structure gives us the best framework for developing our membership in the future," said LI president Neil Williamson. "Our future success as a modern profession depends on wider and deeper engagement with scientists, researchers and teachers and those in related professions."