It is believed that some cultivated pears frequently escaped from cultivation and became feral.
This forces licence-holders to master a suite of skills from cultivation to distribution.
The number of acres diverted from cultivation fell sharply, however, in the late 1970s and early 1980s.
They are widely grown in suitable climates in Central and South America and have escaped from cultivation.
The apple has disappeared from cultivation, but Mr. Brinkley hopes that somewhere, on an abandoned farmstead, a Taliafero apple tree clings to life.
The mixed forests suffered most because their relatively rich soils and long and warm growing season promised good returns from cultivation.
Within a year the entire supply chain in Colorado and Washington, from cultivation to manufacture to retail, will be within the law.
By legalising cannabis from cultivation to retail, these places have snatched the industry away from crooks and given it to law-abiding entrepreneurs.
In addition, such concentration was accompanied by a shift from cultivation to grazing, which reduced employment and increased the poverty of the peasants, producing a crisis.
The arrest of the Brazilians, however, bolsters the longstanding contention of Colombian military and American counternarcotics officials that the Marxist guerrillas are involved in every phase of the cocaine trade, from cultivation to distribution.
Another option is to re-start construction of the half-completed dam at Badush, but the smaller reservoir would likely require tens of thousands of acres of land to be removed from cultivation.
