This article is from the Aquaria: Plants FAQ, by multiple authors.
Many aquatic plants are now sold in potted rockwool. Plants with
delicate roots, such as Cryptocoryne and Anubias, are usually best
left in the rockwool wadding, especially if you have to move them
around in the tank. Leaving them potted also can reduce transplant
shock; otherwise you must be patient and allow the plants time to
recover in their new substrate. You can bury the pots in your gravel
to conceal them. Some folks like to cut away the plastic pot, and just
leave the plant in the wadding so it can grow out into the substrate.
 
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