I am always impressed with aquascapes that have the rounded stem plants in them.
Like this one for example:

(from the gallery at aquaforestaquarium.com)
Do the aquascapers trim these to make them rounded or is it more planting them together to get them rounded? And what kind of trimming techniques would be used?
I can't get my stem plants to look rounded like that no matter how hard I try.
Any tips?