[header] How to grow saguaro cactus [title] Select a container for your saguaro cactus seeds. [step] Choose a small-to medium-sized plastic planting pot with drainage holes. [title] Mix soil and fill the pot. 
[step] Saguaro, like other cacti, need extremely loose, loamy and coarse soil that is free of organic fertilizers like manure. [substeps] Combine 1-part each of sand, peat moss, turf soil and garden loam.