D.C. Mun. Regs. tit. 11, § 3406
3406.1 All plantings and landscape elements used to calculate a property's GAR must be maintained for the life of the project. If, for any reason, the installed landscape elements fall below the minimum required GAR score, new eligible landscape elements shall be added to compensate and result in the required ratio. These elements are not required to be the same as the submitted plans, so long as the GAR achieved is equivalent.
SOURCE: Final Rulemaking published at 60 DCR 10077 (July 12, 2013).