How often should you change your potting soil?

Gardening experts recommend washing chemicals from potting soil, also known as leaching, and replacing it every year before planting something new. Photo: dpa/Karl-Josef Hildenbrand

Plants soak up everything that's in their potting soil, including any chemicals or pesticides.

Therefore, experts recommend washing the chemicals from the soil, also known as leaching, and replacing it every year before planting something new.