To clarify, this is from Cambridge:
fallow
adjective
1 describes land that is not planted with crops, in order to improve the quality of the soil:
Farmers are eligible for government support if they let a certain amount of land lie fallow.
2 describes a period of time in which very little happens:
August is a fallow period in British politics.
fallow
adj 1: left unplowed and unseeded during a growing season; “fallow farmland” 2: undeveloped but potentially useful; “a fallow gold market” n : cultivated land that is not seeded for one or more growing seasons
Source: WordNet ® 2.0, © 2003 Princeton University