2 U.S.C. § 2145

Restriction on use of appropriation for Botanic Garden

On and after July 31, 1958 , no part of any appropriation for the Botanic Garden shall be used for the distribution, by congressional allotment, of trees, plants, shrubs, or other nursery stock.

( Pub. L. 85–570 , July 31, 1958 , 72 Stat. 450 .)