In the right environment, agave also reproduce vegetatively. They put out offshoots, some of which will produce their own roots.
Once you are closed in on all sides by clone siblings, your next best bet is to try to spread to a new spot. Reproducing sexually gives you a chance to expand to the next few habitable areas.
Then you die, leaving an open space in the middle of all your clones. They fill in and one of them has an opportunity to repeat the process in a few years.
My read on this is that desert, rocky terrain, and epiphytic plants find small microbiomes where they can survive. Once they have exploited those resources, once they've 'walked' looking for other spots very close by, they can't just move a couple feet away. They have to fly, and fly far, or die trying.
I'm positively blown away by the grapes we planted last year. We had accidentally left a hole in our bird netting and a deer got in and stripped both vines bare, as well as breaking many of the core tendrils. Swore they were going to die; within a month they had doubled their previous size, put out an entirely new and more vigorous crop of leaves, and then proceeded to produce two entire bunches of Riesling. (on year ~1.5 after planting).
As someone who kills most everything I put in the ground, so much love for the robustness of grapes; they probably put out at least a few inches of vine a day even at this point.
>During World War II, kudzu was introduced to Vanuatu and Fiji by United States Armed Forces to serve as camouflage for equipment and has become a major weed
It’s also similar to what many grasses do. I suppose they’re all related to asparagus.
Also it’s interesting to identify the various types of spiny grass.