Ground Walnut Husk is a very popular grain when making natural exfoliating scrubs. It is finely grounded, making it an ideal additive to face, foot and body scrubs. It polishes away dry and dead skin cells revealing skin that is smooth, soft and refreshed. Ground Walnut Husk is a very popular grain when making natural exfoliating scrubs. It is finely grounded, making it an ideal additive to face, foot and body scrubs. It polishes away dry and dead skin cells revealing skin that is smooth, soft and refreshed.