In the formal language of economics, X and Y are substitutes if the demand for X increases when the price of Y increases, or a positive cross elasticity of demand.
Potting mix is the material that goes into a garden pot before you put seeds and plants into it. 1  It keeps the plant in place. 2  It holds water for the plantâs roots to soak up.  It contains nutrients that feed the plant.
Strictly speaking, any distilled spirit is an eau de vie. Cognac is an eau de vie made from wine; Calvados is an eau de vie made from cider. Scotch whisky is an eau de vie made from malted barley, and its name comes from the Gaelic word ''uisgebeatha,'' meaning -- you guessed it -- water of life.