Elderflowers used in this recipe are the flowers of the tree known as black elderberry. The flowers are white with yellow stamens. You can harvest them between May and June. The Black Elderberry is a tree that grows over 3 m high and easily reaches 8 m or more as an adult.
In case of doubt, refrain!!
You can replace the elderflowers with acacia flowers or other edible flowers of your choice.
You can also add orange in the preparation, or spices to flavor the syrup (cardamom, cinnamon, vanilla...).
You can put less lemon if you want a less lemony taste.