I am trying to find the best soil mix for Carex Testacea. I tried giving farm manure (recommended by the nursery I bought it from) but after a week the tips of the leaves started wilting and turning into straws. So I took it out of the ground. Someone in a Web forum said Carex Testaceas don't like much nutrition and just need sandy loam. The plant label says I should use acidic soil improver and general compost. But I am not sure how much I can trust this.

I may treat it like other rock plants, which like sandy soil and peat. But I am not sure if Carex Testaceas like peat. Can someone tell me if this will be good for the plant? Or should I follow what the plant label says?

Thanks.