Claim: Coca is grown in farms.
Evidence: The plant is grown as a cash crop in Argentina , Bolivia , Colombia , Ecuador , and Peru , even in areas where its cultivation is unlawful.
It is typically purchased by parties separate from a farm.
In earlier times cash crops were usually only a small -LRB- but vital -RRB- part of a farm 's total yield , while today , especially in developed countries , almost all crops are mainly grown for revenue.