The saguaro cactus [Carnegiea gigantea] may sprout from seed within 2-4 weeks. But it'll take 40+ years for the cactus to sprout branches and flowers. During the first four decades of its life, it concentrates energizing photosynthetic products into such life supporting processes as growth and water intake.
Saguaro is a large, tree-sized cactus species in the monotypic genus Carnegiea.
It can take anywhere from a few weeks to several years for a saguaro seed to sprout, depending on environmental conditions such as temperature and moisture levels. Some seeds may require scarification or soaking to germinate.
sunflower seed
The giant cactus found in the desert regions of Arizona is called the saguaro cactus (Carnegiea gigantea). It is known for its tall, tree-like structure and can live for over 150 years.
A saguaro would probably quickly get root rot and die as the soil in Florida is much too moist for a saguaro to remain healthy. They need a fast draining soil that does not remain wet for long after a rain.
Three (3) feet (0.9144 meters) may be how tall a saguaro cactus plant (Carnegiea gigantea) is after 15 years.Specifically, the saguaro is a slow-grower among plants in general and cactus plants in particular. But it makes up in mature height and longevity for what it lacks in speed! For example, its expected life span may reach 100-200 years. Also, its expected mature height may range from 15 - 50 feet (4.52 - 15.24 meters).
That depend upon the species. Some, such as the opuntias (prickly pear, cholla) can go from seed to a sizable plant in just a few short years. Others, such as the saguaro and barrel cacti, can take many decades to grow to a respectable size.
There are saguaro cacti that live in the desert but there is no Saguaro Desert.
date palms , cactus and plants with long roots.
The look of a fully grown cactus depends upon the particular cactus. For example, jumping cactus [Cylindropuntia fulgida] sheds its perilous spines once it's fully grown and heading into old age. In the way of another example, old man cactus [Cephalocereus senilisand Oreocereus spp] becomes enveloped in a downy beard from its fine, long, soft, white outer spines. As yet another example, the giant saguaro cactus [Carnegiea gigantea] finds its towering columnar profile enhanced with branching arms once fully grown.
Not very often because cactuses are designed to live a long period without water. I would suggest once every week is fine.
plants that can stand for long periods of time w/o water like cactus