Fig tree roots generally are very invasive, although much depends on the tree’s variety, its planting location, and the overall soil quality. Most fig trees, if they are planted in optimal conditions, spread their roots far and wide, which can make then troubling if they are planted in the center of a landscape design. These trees usually do best on the outskirts of a yard or surrounded by plenty of open space. Gardeners can often take steps to minimize root invasion by planting trees in pots or building underground retaining walls to keep the roots structured.