Some facts:
Can grow up to 50 feet high.
They start off growing VERY slowly, being only half a centimetre tall after one year. A plant about 1.5 metres tall is likely to be about 30 to 40 years old. Their growth speeds up as they have more surface area, and the tallest ones might be about 200 years old.
Branching starts once they are about 4 - 5 metres tall, and is thought to be random.
Flowering starts at between 35 to 70 years of age. Saguaro flowers open about 10 pm and close late afternoon the following day. The fruit contain seeds which need at least 3cm of rain over three days in order to germinate, so the summer rains are essential. Of those that do germinate, it is thought that fewer than one percent survive.
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| They normally flower in spring but sometimes have an odd flower in summer. |
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