The invention relates to a nutrient medium for cultivating plants, characterised in that it contains: (a) 3 g/l to 18 g/l agar； and (b) 0.5 g/l to 3 g/l carrageenan, as well as to plant plugs which contain such a nutrient medium. The invention also relates to a method for the production of the plant plugs and to a method for the automated or partially automated cultivation of plants, using said plant plugs.
