They help assure good drainage in the bottom of pots.
Mixed with compost they will improve the aeration around the roots.
Aesthetics, they decorate the surface of pots and planters.
Approved name: NF U 44-551.
Composition: Pearls of clay.
Period of usage: J.F.M.A.M.J.J.A.S.O.N.D
Ideal period of usage