When should I pick elderberries?
From Greenfootsteps' "Elderberry Recipes for a Healthy Winter Edinburgh":


  Pick elderberries when they are fully ripe in early autumn. The bunches should be starting to droop downwards with the weight of the fruit. Use a fork or your fingers to gently prise the fruit away from the stalks. This can be a bit fiddly but you don't have to be too perfect with it - a few bits of stalk will not matter.