Created by Heissner who made the line of Heissner gnomes .
Quoting:
Earthenware Head:
These heads were also made in Thuringia, Germany, from about 1900 to 1940 by several companies including the Griebel's and the Heissner's. In those days they were called 'grass heads' - the heads were filled
with water, the clay soaked up the water and then grass seeds grew in the hair
relief, etc. They looked very funny after a few days. The catalog page with the ad is the best guess for the origin of this particular head...
Heissner catalog where this page comes from is dated to either the very late fifties or early sixties...The back of the head says "Germany." It is on ebay as item # 6257012626......If it hasn't closed out by now.......