The groundnut plant usually gives an indication of when to harvest. They should be harvested when approximately 75 % of the pods  have reached the maturity; that is when the leaves turn to yellow colour and dry at the tips. At the same time, the soil desiccate to such an extent that the plant withers and the seeds in the pods begin to thrivel and take on a ripe appearance.

Loosen the soil around the plants with a spade or garden fork before harvesting peanuts. Pull up the plants and shake the excess soil from the roots, leaving the pods attached. Check the soil to make sure you aren't leaving any pods behind.