The 4% abv product will be launched in 56.8cl bottles from April.
The cider joins a range that includes blackberry, peach, pear and apple.
The company is planning a "major investment programme behind its Old Moors and Three Hammers brands later in the year", said chairman James McIlwraith.
He added: "Though we are well
known in the south west, we
want to add our brands to the national cider map
and play a
role in helping to grow the sector."
that the newcomer is served over ice.
McIlwraith added: "Elderflower is already a highly established natural flavour in cordials, and its soft and floral tang provides a perfect accompaniment to the traditional Old Moors cider recipe."