I did several batches and made 11 quarts of mint syrup (7 chocolate mint, 3 spearmint, and 1 that is a combo).
These are the quantities I used (per batch): This batch will make about 3 quarts of syrup
6 cups Herb leaves (loosely packed) You can use any herb you have: Any Mint, Lavender, Basil, etc.
10 cups Water
This made about 8 cups of liquids after simmering and so I added 8 cups of sugar
1/3 cup lemon juice