To my understanding each species has a life cycle and some are over 100 years. When they reach the seed stage it happens worldwide for that species. The stuff about the rat plagues is true and some cultures feast on rat for a year or two. I'd collect as much seed as you can and then the following year germinate it and grow as much as you can...there will be a lot of others who are not aware of the cycle who will want to re establish their groves as well and I think you might be able to make a tidy profit for your efforts in this vein. Selling the seed or the new plants will be an opportunity that comes once in a generation for some species and I'd guess the longer the life cycle the harder it will be for some people to get their groves back up and running. For some groves it will take as long as ten years for the root structures to develop into vibrant levels again, I'm guessing that like with any grass species you could speed this up with good fertilization technique.
Best of luck!
