Combine all ingredients in a clean fermentation jar: In a large glass jar (2L capacity), add 2 litres water, 200g sugar, and mix well using a whisk until the sugar is completely dissolved.
Next add the sliced oranges and lemons followed by the 20g chopped ginger, 20g of edible flowers and mix.
Cover and ferment at room temperature: Cover the jar with a clean cloth or a loose lid and leave at room temperature (18–22°C / 64–72°F) for 3–5 days. Stir once or twice daily to submerge the petals and prevent mould.
Monitor fermentation: Look for bubbles, cloudiness, and a gently tangy taste — these are signs of active fermentation. Depending on room temperature, this may happen faster or slower.
Strain and bottle: When the soda is pleasantly floral and slightly fizzy, strain out the solids using a fine sieve or cheesecloth. Pour the liquid into swing-top bottles, leaving about 2cm (0.8 in) headspace.
Build carbonation: Seal the bottles and leave at room temperature for 1–2 days to naturally carbonate. Burp once daily to release any excess pressure.
Chill and serve: Refrigerate once carbonation is to your liking. Serve chilled and open bottles with care — the soda will be beautifully fizzy, fragrant, and alive with springtime flavour.