A seed germination medium comprises a cover layer 10 and a base layer 12 and a plurality of seeds 14 disposed therebetween, the cover layer and base layer both being formed from a biodegradable material; the cover layer being permeable to water, and the base layer being formed so as to allow roots of germinated seeds to grow downwards through the base layer, wherein the cover layer has on an upper surface thereof a coating of a water-absorbing substance or wherein the base layer has on a lower surface thereof a coating of a water-absorbing substance. The water absorbing substance may form an adhesive layer which is capable of sticking to substrate particles such as sand and soil. Also disclosed is a method of depositing seeds on an agricultural substrate which comprises laying over the substrate a membrane containing the seeds wherein the membrane has a lower surface that adheres the membrane to the surface
