The main roadblocks to developing fully sustainable gardens are factors that affect the water used in growing plants. Water ground soil evaporation is the amount of water that evaporates in an area of land in a given time frame. Groundwater erosion is a negative effect of having water flowing underground. Water efficiency is the amount of water that, when put into an area, is actually used by the plants. This is used to describe overwatering. If these problems can be solved or minimized, a garden can be created that, once planted, would be able to survive without human intervention.