Nettles were legendarily brought to Britain by the Romans to help invigorate their tired legs, but nettles were likely already here so the Rhynie Picts may have enjoyed a cup of nettle tea. High in minerals, nettles are a tasty alternative to spinach when carefully picked and cooked before flowering.  After flowering, the seeds can be collected, dried and used as a nutritious seasoning to sprinkle on savoury dishes to supposedly aid the adrenal system.