A stunner for growth and cyme size.  We can only describe Pocahontas as vigorous and robust.  Expect flowers and berries in the first year.  Our first year, Pocahontas reach 3-4 ft and produced several cymes and berry clusters.  Want elderberries yesterday?  This is your variety.  But she needs room, don't crowd her and plant at spacing in hedgerows of 4ft with 12 ft between rows.  If you plan to grow as a single shrub, give a 8-12ft spacing all around.