The problems related to the lack of land and financial capacity to buy agricultural inputs, especially in slums can be solved by using sack gardens. Earth-filled sacks are placed on doorsteps and used to grow vegetables in. Sack gardens do not require much agricultural land nor much water. They are easy to prepare (there is no need for any specific technical knowledge) and require simple and inexpensive materials (sack, stones, soil and manure). Therefore they are easily replicable. Vegetables produced in sack gardens allow to diversify diets and thereby help prevent micronutrient deficiencies.