Pasture

Pasture is one of the most valuable crops in the Landleven game.

It costs 15 coins per plot to plant, has a growth time of just 1 hour, and could be sold for 17 but is much more valuable if fed to one of the animals that will be available fairly soon after you unlock pasture.

Feed it to Charolais Cattle or Limousin Cattle to produce beef worth 20 coins, which has other uses such as Beef Salami selling for 24 (a profit of 9 coins per plot-hour).

Feed it to a goat, however, and the resulting Goat Milk is worth 37, distinctly better than salami (a profit of 22 coins per plot-hour). But wait, there's more. Put that milk into a Cheese Master (one of the items of gear you received to start the game) and the resulting Goat Cheese sells for 47 (a profit of 32 coins per plot-hour). There are other uses for goat milk too.

Buying a goat is costly, but you can get a free one as a reward in the Viva l'Italia mission and occasionally as a reward for some other challenge.