Gymnocalycium vatteri (Cactaceae) This is a very slowly growing specie. Generally solitary but old specimens may cluster from the base. The plant is flattened with dull grey-green or blue green colour. The flower is broad, white with pink to brownish-red throat. Sowing : Sow seeds in summer in a well drained medium. Locality : Ex Hort. Date of harvest : March 2012.? Locality : Ex Hort. Date of harvest : March 2012.