In Liguria, basil is grown year-round in greenhouses, though it’s generally agreed that late spring is prime harvesting season. During the warm months, basil is grown for 28 to 30 days until it reaches a delicate maturity. In winter, the grow time stretches to nearly 60 days. When plucked, the leaves are still soft and light green, the stems thin and wispy. For it to be called Basilico Genovese, farmers must follow DOP rules, which do not allow pesticides or chemicals and require greenhouse shelter.