On this site, Amazon and Ozelot swords are under the substrate rooted section. In the profile it says they are propagated by splitting them at the rhizome...can they be planted in the substrate or should they be tied to something?
Plant in the substrate up to the crown of the plant. They don't have rhizomes like java ferns and anubias. They have a large crown area where the leaf stems meet and you can carefully separate that area to start a new plant.
Plant them to the point where the roots are covered, but no deeper. Having the roots show a little bit above the substrate is much better than planting too deep. Sorry, I can't picture a bulb so I can't be more precise. If you cover no more than the roots, you can't go wrong.
The larger-sized species of Echinodorus (swords) do in fact have a true rhizome. As do Cryptocoryne. It is more noticeable with crypts, but if you have a sword that is a few years old the rhizome is more obvious. I have a couple plants that have a rhizome about 2 inches in length.
I find the easiest way to plant swords is to make the depression in the sand, push the entire root system down, cover it over, then gently pull the plant up until the crown is visible. The crown being the point at which the leaves arise upward and the roots downward. The rhizome is below the crown.
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