Question

The act or process of creating new forest by planting saplings

Answer 1

Hello mate,
The act of process of creating new forest by planting saplings is called reforestation.

Answer 2

Tree-planting is the process of transplanting tree seedlings, generally for forestry, land reclamation, or landscaping purpose. ... It involves planting seedlings over an area of land where the forest has been harvested or damaged by fire, disease or human activity.