Grass is food, serious staple food such as bread, rice, potatoes and porridge for people. A food source qualifies as a staple if it can be stored for consumption during the off-season as well. Well, bushveld grass qualifies as it is still food when dry, although not quite of the same relish during the winter months. As last year’s grains aren’t always quite the same for people.
Cyclic replenishment is a big factor of grassland and savannah. That is why so many ungulates fit into the carrying capacity of the sweet grass veld types. Why buffalo can be in this condition in midwinter.