I was reading At Home: A Short History of Private Life by Bill Bryson, when I came upon this:
Traditionally, most English farmland was divided into long strips called furlongs and each furlong was left fallow for one season in every three—sometimes one season in two—so that it could recover its ability to produce healthy crops. This meant that in any given year at least one-third of the nation’s farmland stood idle. In consequence, there wasn’t sufficient feed to keep large numbers of animals alive through the winter, so landowners had no choice but to slaughter most of their stock each autumn and face a long, lean period till spring.
Bryson explains that it wasn’t until the eighteenth century that English farmers learned about crop rotation: planting crops like clover or turnips in those fallow furlongs that would both replenish the soil and provide winter fodder for animals. More surviving livestock in turn resulted in more manure, which improved the soil in its own right. This agricultural revolution made both the quality and the quantity of English harvests far more reliable.
So, if the English had begun practicing crop rotation centuries earlier, would Samhain be part of the modern Wiccan calendar?