After snipping the 'umbrellas' from your elderberry bush, use a plastic fork (held backwards) to glean the black berries from the vines. Package and freeze. Wash just before using.
Harvesting Common Garden Vegetables
Harvesting Sunflower Seeds?
Selling Trees on Your Land for Lumber
Harvesting Onions?
What Are Hedge Apples Good For?
Harvesting Potatoes from a Potato Tower