This beer drew out the some of the tartness from the hibiscus flowers. I didn't add any lacto to this, its just the way it came out of fermentation.
Mash grains, and boil as usual, at the beginning of the boil, 60 mins left, add in the first addition of Amarillo hop pellets (.2 oz). With 10 mins left in the boil add the second addition of hops (.3 oz). Finally, with 5 minutes left add in 1/2 cup of dried hibiscus flowers. At flameout add the agave nectar.
Chill wort down to 65-70 degrees Fahrenheit. pitch 1/2 tsp of Safale US-05 dry yeast (I didn't bother to make a starter), aerate for about a minute or so.
Ferment for 2 weeks. After 2 weeks add 1 additional cup of dried hibiscus flowers and let ferment for another 3-4 days.
Sanitize your equipment, bottle, relax until carbonated.
MY MEASUREMENTS:
Original gravity: 1.044
Final gravity: 1.004
ABV: 5.25
don't ask how. I don't know either.