Hi..

Anytime that one of my plants has arrived in a little
plastic pot stuffed with that white packing stuff I have
removed the pot as well as the white stuff.

White stuff: The substrate in the pots _here_ is rock-wool
If it were rock-wool too I would remove it completely and
would rinse the plants and the roots before putting them
into the tank.

[Echinodorus]
I have no doubt it will grow into a large and
beautiful centerpiece, but the particular location I have
in mind calls for a plant with more height than width.

Height and width are influenced by substrate hight and its
"outfit" depends on daily lightening duration, illuminance
and temperature.
--
cu
Marco