Money doesn't grow on trees
Meaning
Money and resources are limited, so they should not be wasted.
Usage
Often said by parents, managers, or anyone pushing back against unnecessary spending. It can sound practical, stern, or teasing.
Origin & History
Origin notes can vary by region and source; this page gives the commonly reported explanation and usage context.
A plain literal image: unlike fruit or leaves, money cannot simply be picked from trees when more is needed.
The saying became especially common in 20th-century family and household English as a memorable lesson about budgeting.