Growing elder flowers for drinks

In his books, the late John Seymour tells us that in addition to the many foods found in fields and pastures, like rabbits, berries, nuts and fruit, some weeds are also edible.  In the UK, elder trees grow in the wild, are often thought of as weeds, but the berries and flowers are collected to make drinks and relish.  They're not common in Queensland but we have an elder plant and yesterday I