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The saguaro cactus is the largest cactus in the United States, and will normally reach heights of 40 feet tall. The tallest saguaro cactus ever measured towered over 78 feet into the air. The saguaro cactus grows as a column at a very slow rate, with all growth occurring at the tip, or top of the cactus. It can take 10 years for a saguaro cactus to reach 1 inch in height. By 70 years of age, a saguaro cactus can reach 6 and a half feet tall, and will finally start to produce their first flowers. By 95-100 years in age, a saguaro cactus can reach a height of 15-16 feet, and could start to produce its first arm. By 200 years old, the saguaro cactus has reached its full height, reaching upwards of 45 feet tall. Some saguaros have been seen with dozens of arms, while other cactus never produce a single one. Why this happens remains one of the desert's mysteries 1 Select a container for your saguaro cactus seeds. Choose a small- to medium-sized plastic planting pot with drainage holes. 2 Mix soil and fill the pot. Saguaro, like other cacti, need extremely loose, loamy and coarse soil that is free of organic fertilizers like manure. Combine 1-part each of sand, peat moss, turf soil and garden loam. Fill the pot 3/4 full of soil 3Place holes in the soil for the seeds. Poke several small holes in the soil 1 inch (2.54 cm) apart using a pencil. Make the holes about 1/8 inch (0.4 cm) deep. Place the saguaro seeds in the holes and lightly pinch the soil closed over them. 4Cover the seeds. Place plastic wrap securely over the pot. Poke holes in the plastic wrap to aerate the soil. 5Place the pot at room temperature or warmer in a location that is well lit, but not in direct sunlight. 6Keep the seeds moist. Sprinkle water over the soil every 10 days so the seeds don't dry out. Even when growing from seed, cacti do not like too much water, so do not water more than every 10 days.
