I thought it was too late this year - plants already flowered and now old - but maybe there's a second crop (like our late cropping rassies)
Pick at least half a gallon of nettle tops (top 2 or 3 pairs of leaves - just the tender ones)
Wash, simmer 45min with a bit of lemon zest and some ginger.
Strain, pour onto 2lb12oz sugar, juice of lemon plus a tsp+ more of juice, crushed campden tablet, nutrient.
Make up to gallon with boiled water, leave to cool. Pitch yeast.
Rack after about a month or earlier if there's loads of crud on the bottom
Should clear naturally at around 8 weeks, bottle with sorbate&sulphite
Acceptable immediately but much nicer if left at least a month, and improves further thereafter