The Huntington Botanic Gardens near Los Angeles, California, has a
marvelous collection of large barrel cacti, most of which were handed over
to them by conservation officers, customs agents, etc., after confiscation
of the plants as stolen or smuggled. I don't know if they propagate these
confiscated species from seeds at the Huntington or not. They do attempt
to propagate some of their rare species of plants.

I have assumed that many botanic gardens are designated to receive plants
confiscated by the government for lack of proper documentation. Does
anyone know if this is true of other gardens besides the Huntington?