I just don't know, Jen. As you say, it doesn't make much sense that one clump falls over the the other doesn't. Is one clump, the upright clump, getting more direct sun than the other? Does one clump get more water for some reason? Without adequate water in this hot time of year will result in them "wilting" and falling over. That's really my only guesses. As I said, my shastas are so thick and so lush, they fall over all the time. For me at least, that's just their nature.
