Water the agave plant in at planting time. Soak the soil surrounding the plant so the root is thoroughly moist but not in standing water.
Apply water to established agave only when the surrounding soil feels completely dry to the touch. Give it just enough water so that the soil is moist but not soaked.
Water the agave deeply, completely wetting the ground surrounding it, once or twice per summer if rainfall is below average.
Refrain from watering the agave during cold to freezing months. Remember that even desert areas can become extremely cold at night. Water only during warm enough periods that the moisture around the plant's roots will not freeze and damage the root system.