Just read an article in the March issue of Horse Illustrated about grass founder. Found it interesting and realized that most of the advice given I was already following except one thing I did not know and that was to be just as careful during the autumn with grass founder as you are in the spring. The article states that, "Browning fall grass can be as high in fructan-or even higher- than green grass." I've always given my horses a few hours in the morning when I first introduce them to the spring pasture. Autumn, I've personally never worried so much about because I have a small pasture and it's fairly grazed down by then, as much as I try to rotate and save and I usually supplement with a nice 50/50 mix hay.