Combine dried hibiscus with 1 gallon of water in a large pot.
Bring the pot to a boil, then let the hibiscus steep for 30 minutes.
In a fermentation vessel, mix honey with 1 gallon of water.
Add frozen strawberries and blackberries; stir well.
Strain the hibiscus tea to remove solids.
Pour the hibiscus tea into the berry honey mixture, stirring vigorously.
Incorporate wine yeast and mix thoroughly.
Seal the fermentation vessel with an airlock.
Allow the mead to ferment for 2-4 weeks or until fermentation stops.
Maintain a temperature range of 60-70°F (15-21°C) in the fermentation vessel.
Temperature impacts yeast activity and the mead's flavour.