Wiltshire,
United Kingdom 
what pruning is required if so how
On plant
sambuca (elderflower) red and yellow
23 Feb, 2010
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With elderflower (we have the Black Lace type) very little if any pruning is necessary, though to keep the plant 'youthful' I'd just clear out the old woody branches from time to time to keep a good shape. Most of the flowers and fruits seem to be borne on year old or new wood.
23 Feb, 2010