For some reason, the plants in the botanical garden (in the Sink) won't "reseed" unless I return to the Mojave. Tried waiting for several days both inside and outside The Sink and neither worked. I finally returned to the Mojave, waited there for three days, came back, and they had reseeded.
But this is perplexing because I harvested the garden a number of times before completing the DLC-- before I was even able to return to the Mojave.
Anyone else encountering this?