Squeeze the centers of unshelled peanuts to crack the shell and release the nuts. Remove the shells and as much of the skin as possible. Spanish peanuts have papery skin that falls right off of the nuts.
Soak a large, 100 percent cotton towel in room temperature water. Line the bottom of your plastic container with the towel. Spread your peanuts out in a single, clustered layer over the towel. Soak a second towel and cover the peanuts with it.
Check on the peanuts every 24 hours. Spray the towels with water so they remain constantly wet. Your peanuts are starting to sprout if you see a little white nub on one end of each nut.
Wait until the sprouts are as long as the peanut before eating or growing.