Loosely pack elderflower umbels into 1 gallon jar, breaking off and discarding large stems.
Add lemons, lime and ginger
Gently heat up 2 cups of vodka and add the honey- stirring till well mixed but not hot. Let cool.
Pour honey vodka into jar, top off with remaining vodka.
Seal with lid and store in cool, dark place for 14-30 days.
Pour through fine mesh strainer and rebottle.