Trough underground aquifers, extensive water lines spanning hundreds of miles or desalinization plants.
Because there is no water in polar regions
A lotus plant cannot grow in desert because a lotus plant grow in water and in desert there is no water.
from the sea
It can if you have enough irrigation water supply.
oasis
An oasis !
The question essentially answers itself, since "desert" implies a scarcity of water, while "hydroponics" is a system in which water can be contained and conserved.
You mean tap water? Some regions in Mexico are quite hot and receive a great deal of heat from the sun. To cut on maintenance costs -- pumps could be damaged from overheating -- the municipality would rather pump water during the night. Besides, most homes and buildings in Mexico have a water cistern due to poor reliability on the water supply.
A fertile tract in a desert, where the water table approaches the surface.
an oasis say it with me OASIS =\
An oasis
Deserts are regions which receive such low levels of precipitation (rain) that there is not enough water for many types of plants to live there.