Water vegetables with the last water from clothes-washing, or any water containing a small amount of detergent, which contains the fertiliser phosphorus. Make sure that vegetables receive direct sunlight at least half the day, preferably all day. They should be planted or placed at the north or south end of the house to avoid its shadow. For houses with pets or other animals, fences should be installed around the garden to keep vegetables from harm. Prof. Charnchai Limpiyakorn of Chulalongkorn University's Engineering Faculty, who focused on reviving natural ecology in the city.
Many people give up trying to grow vegetables due to the many difficulties involved.
Some lack the proper methods, while others find it difficult to overcome physical problems of the urban environment. Charnchai, who grows vegetables at home and surveys vegetable gardens, shared common problems urban growers might encounter. He said those who live in congested areas might find planting vegetables difficult. People who live in new housing estates may also have problems, as the soil may be infertile as the result of being dug up from too deep underground. While outside physical factors are essential to planted vegetables' survival, biological factors also play an important role in nurturing vegetables.