Groundnut grows best on a well-drained, light sandy-loam soil. This is because groundnuts require a well-drained soil to prevent waterlogging, which can lead to root rot and stunted growth. Sandy-loam soils also allow for good aeration and root penetration, while also retaining enough moisture to support the growth of the plant. Additionally, this type of soil is easy to work with, which makes it ideal for planting and harvesting groundnuts.