[header] How to grow snake grass [title] Dig a hole. [step] Whether you're planting in soil or water, you should dig a hole large enough to hold the rhizome ball that forms at the bottom of all snake grass. The plant will root from this ball, which allows it to spread wildly. 
[substeps] Snake grass is a plant that spreads wildly by default, and you don't need to be too picky about where you plant it. As long as it gets a bit of sun, it'll have all it needs to grow.