Noticed something seriously missing from your stinging nettles page, a top remedy for hay fever (seasonal allergies) is stinging nettles (which I've personally used and it knocked out my hay fever (fall pollen allergy) out!
I've used stinging nettles tinctures, but boiling them in water a bit, draining off the water (tonic) and drinking works too. I've heard the leaves can be rolled up (needles inside) and chewed is another oral method.
Stinging Nettles for Hay Fever is #1 or seasonal allergies should be top of list (IMHO). Peace