Can you use fabric made from plant fibre (eg. hemp, jute, burlap, hessian etc) for s'chach?
As far as I understand, it grows from the ground, it isn't made into a keli so shouldn't be mekabel tumah and it isn't still connected to the ground, but I know that paper and cardboard aren't ok because they have been processed so much, so not sure if that falls into the same problem?
If it is allowable, would it be considered not ideal and are there any restrictions on it - obviously it would need to be more shade than sun, but is there anything else?