Posted: 18/02/2015 at 17:08
Spring is the best time to split ornamental grasses. Give them a good soaking, take them out of their pots and then just divide up with a spade, bread knife or two forks. Plant the new clumps straight away either in the ground in a ready prepared bed or on pots again. Unless they are evergreens such as carex, you should now be cutting back all the old, dry top growth to allow the new shoots to come through.
Can't help with the Red Sedge.