For both hc and hairgrass, you want to seperate each little stem and plant it. If you don't have the patience, then plant seperate it into the smallest clumps that you could possibly do without ripping your hair out. With the hairgrass, this can be very time consuming even with planting only a 3 gal. If all your ferts, lighting, and co2 are inorder, the smaller you plant the clumps, the faster it'll form a carpet. Hth...
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