Shelf Life of Potato Left it in a basket, with passage of time potato tends to lose mass and develop molds. How to preserve this tuber with out getting moulds on it and prevent it from becoming softened. Chemicals that can prevent this are undesirable and prevailing regulations none can use those chemicals. The best option is to keep it among apple(s). The ethylene gas from apple is adequate to prevent or greatly diminish moulds generation and softening of potatoes. There won't be any mass loss.