The 6 liter bag of potting soil from the Algoflash brand costs only 5.59 euros at Amazon. This soil is intended for green plants and flowering plants that you can have indoors or on a balcony.
It consists of sphagnum peat, mixed plant matter compost, bark compost, wood fiber and NF U 42-001 fertilizer. Amazon will deliver it directly to your home, saving you the hassle of transporting it from a store. Each bag weighs 1.9 kg and can be used to collect several plants.