The animals can work land that is inaccessible to tractors, and vineyard owners say they improve the soil for grapes. But they raise costs as well.
Sussex wineries receive a prestigious distinction, but a Kent winemaker dismisses the award as arbitrary, citing similar growing conditions.
Scientists are looking at ways to determine if grapes from smoky areas can still be used, without adding an unpleasant ashy taste to wine.
It wasn't always cheap, and it wasn't always sold by Trader Joe's.
A loophole allows out-of-state winemakers to use the prestigious name if the grapes were imported.