Nettle as Straw alternative

Since Stinging Nettle (urtica dioica) has long been a plant used for fibre/rope production, and has a lot longer stalks than straw, i wondered if it might be a great alternative.
Nettles are native to many parts of earth, and also very easy to grow in large quantities, while also getting food (leaves, seeds) out of it.

Have any of you ever tried this, or do you know of somebody who has?

Hi Dominik, Welcome to permies!
I've been playing a bit this year with removing the outer skin off the nettle stalks for fibre processing and I have thought that the remaining inner stalks would make a good carbon rich mulch like straw for strawberries for example.
If you're thinking of the fine outer fibres they are typically actually only as long as the leaf node spacing. From my memories of composite materials however, there is a maximum fibre length beyond which there is no additional benefit in terms of strength. I have no idea what the optimum fibre length may be for cob though!

I'll have to give it a try. We have plenty of nettles to experiment with.