SOURCE OF GROWTH can be defined as a place or environment that encourages growth and development. The crossword solution SEEDBED is an appropriate term to describe this concept, as it refers to the soil in which seeds are planted and nurtured until they reach maturity. A seedbed provides the necessary nutrients and conditions for a seed to germinate and grow into a healthy plant. In a similar way, a source of growth can provide the necessary resources and support for an individual or organization to develop and thrive.