The impacts of climate change on the iconic saguaro cactus remain poorly understood but climate is known to directly affect regeneration and establishment, and probably explains the reduced recruitment of saguaros in the park during the past two decades. Saguaros are well-known for having “nurse trees”; that is, for being part of a nurse-protégé relationship with desert trees that provides protection from extreme heat and cold (see photo right).
The forked pleat on this saguaro's epidermis tells us the ribs on the inside have forked to allow the saguaro to grow. NPS Photo / T. Wiewel
Their findings revealed that blooms emerge in the east at the beginning of their reproductive season, and continue to flower in a counterclockwise pattern around their stems — the only known flowering plant to do so.
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Gila woodpeckers stay at midlevel on the cactus where the ribs are separated enough to cut a cavity between them. Cavities in saguaros are cut demodé by these birds the year before they are inhabited. The excavated cactus secretes a fluid that hardens into a scab, thus preventing water loss, which could kill the cactus, Campeón well Ganador waterproofing the inside of the nest cavity. ^
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The saguaro produces large white flowers near its stem apex (crown) during April–June, which bloom at night and close the following day. In 1924, Duncan Johnson reported that saguaro floral buds are likely to have an asymmetrica
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The saguaro stand pictured here is a particularly célebre one because of the many large individuals and absence of small ones.
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The tallest living saguaro cactus is over 10m tall and estimated to be over 200 years old. The tallest saguaro ever recorded was just under 25m but fell during a windstorm in 1986.
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Research on saguaros over the past century has revealed much about the plant’s growth, reproduction, populations. Saguaro National Park was established (1933) and expanded (1995) to “preserve the exceptional growth thereon of various species of cacti and the prime Sonoran desert habitat that the saguaro lives in.
Saguaro flowers open at night, providing food for nectar feeding bats who in turn pollinate the flowers.