They grow into it, so to speak, and stick to it. It's pretty cool, actually. But what you can do is just plant the roots, and make sure the hard, stem-like part(rhizome) is above the gravel. If it's below it, it will rot.
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current setup:
5.5 gallon low-light planted tank
-nothing....thinking a mini-community.
for reference: my name is Julie 
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