I have read suggestions to trim plant roots, but I have never done it. Echinodorus plants have huge root systems, and they are heavy root feeders. If they come in a small pot, remove the pot and as much of the white wool as you can but be careful, roots especially small roots can be well "rooted" in this medium. Poke the entire root system (I usually sort of roll it up so it is easier) into the substrate right down to the glass, tehn fill the substrate in around the plant. Gently and slowly pull the plant vertically up to make sure the crown is not buried (it willrot and kill the plant). Unbless you havee digging fish, the plant will root. Plant these sturdy plants before water is added if that is possible. Just be careful as the leaves if they are the submersed form will be less rigid and can get broken off. Poke a Flourish Tab down about an inch from the crown.