The invention relates to a culture medium package suitable for growing plants, especially in greenhouse production. The culture medium package contains a basically fertilized or non-fertilized culture medium portion (1) and a fertilizer portion (2) in a direct contact therewith, the fertilizer contained therein being blended by no more than to a slight degree with the culture medium. The fertilizer portion (2) is in such a condition that the plant roots are able to penetrate therein. Thus, no supplemental fertilization is required during the growing season.