Green Cabomba, should i bunch or seperate?

Hey guys i bought this plant just the other day, and am wondering if i should stick it in the gravel as a bunch or seperate them. The reason i ask is because there seems to be less light getting to the bottom due its density as a pack. I looks very nice as a pack, but the last thing i want is for the stems to dry out at the bottom and the plant breaking at the stems as a result.

a picture of the plant can be seen here for those not sure of this speci.......

http://www.aquahobby.com/garden/e_cabomba.php

Thanks guys!

Mako said:

Green cabomba is a great plant (tends to plug up filter intakes though). I'd plant it in bunches of two or three plants. Looks good, gets good light penetration, and they spread quickly. Plant the small bunches about 6 inches apart to allow room for spreading.

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Thanks Mako!

Well, with the amount of plant i got for 6 bucks, i should easily be able to fill my whole back wall of me 72 gallon tank