Final answer:
Criollo is a variety of cacao that is difficult to grow because it is susceptible to diseases, pests, and requires specific climatic conditions, making it less commonly cultivated.
Step-by-step explanation:
The statement 'T or F: Criollo is difficult to grow' pertains to a variety of cacao known as Criollo, which is indeed difficult to grow. Criollo is a high-quality but sensitive variety of the cacao tree, whose beans are used to make chocolate. It is susceptible to a range of diseases and pests and also has specific climatic requirements, which make it more challenging to cultivate compared to other varieties like Forastero or Trinitario. Criollo cacao is prized for its flavor and is considered a premium product often used in high-end chocolates. Due to its particular growing conditions, it is less commonly grown on a large scale, which also contributes to its rarity and distinctness.