A simple and delicious fast-fermented beverage you can make from different types of edible flowers.
Place all ingredients in glass or metal jar (not plastic) and stir until sugar is dissolved. Place out of the sun in cool indoor environment not warmer than about 71°F. Affix breathable cover (linen cloth or paper towel work well) over top of container with rubber band or string.
Stir mixture vigorously twice daily, once in the morning, once at night.
Once you start noticing bubbles, that means the yeasts are proliferating and off-gassing. This point varies from 2-4 days depending on the flower type, each of which will have its own unique yeast and bacteria species. Begin doing small taste tests at this point so you develop an intuition about how the ferment develops with age.
~14 days is usually the longest you'll ever let a quick flower ferment develop. Usually they're ready within 7-10 days. Strain out flowers and place finished ferment in jars in your fridge. The cold temperature arrests fermentation/microbial activity. Begin drinking immediately as-is or use in mixed drinks. These ferments continue to "dry" (e.g. lose sweetness and sugar content) the longer they're in the fridge. They're best consumed within 3-6 months.
Fermented sparkling wild flower cordial https://www.tyrantfarms.com/incredible-edible-wild-flowers/