Posted: 20/03/2014 at 11:40
It would be interesting to know which sedge you have.....description? And Bamboogle is right on both counts....they are usually hard to kill amd they mostly like lots of moisture.
I notice you said the base of the plant was very solid.....did you loosen this before replanting? Did you water very well? Also, it would naturally appear to suffer initially and then make new growth in the spring.
So. I would loosen the rootball, add goodly amount of compost and water well. Then wait for few more weeks to see if re growth occurs.
I would not line the hole as you suggest. Fertiliser isn't really necessary but dried manure mixed with compost and your soil should do the trick.
Its not advisable to replant with the same family of plants but it doesnt mean it wont grow there again. If its what you want to continue growing there then go for it