When the summer monsoon blows in the giant saguaros, one of the biggest of all cacti, are ready to take full advantage of it. After a rainstorm the saguaro's long shallow root system sucks up the water and the pleats on its trunk enable it to expand rapidly. When full, a saguaro stem can store up to five tonnes of water and that's enough to see it through many months of drought. The trunks of these huge plants provide homes for the gila woodpecker. But birds are not the only animals to benefit from the presence of the cacti. During four weeks of the summer the saguaros bloom at night to attract visitors.


夏天的季风吹来的时候，最大的仙人掌之一，巨人柱已经做好了准备，暴雨过后，巨人柱长长的浅根系统，会吸收水分，它躯干上的皱褶，使它可以很快膨胀，巨人柱的枝干，可以储存多达5吨的水，这让它足以忍受几个月的干旱，巨人柱巨大的躯体，为啄木鸟提供了安家之所，但从仙人掌植物中获益的，不只是鸟类，巨人柱在夏天，有四周的开花期，时间是晚上，这时会吸引不少光顾者。