On 11th April 2025, HM the King, as Royal Patron of the Regimental Association of the Argyll and Sutherland Highlanders, planted a tree in the grounds of Balmoral Castle. Prayers of dedication, led by The Rev Col G A Douglas OBE, Regimental Chaplain, were offered along with thanksgiving for all that the late Queen did for the Regiment as Colonel in Chief, Royal Colonel and Royal Patron. Prayers were also offered for the King's Majesty.

Amongst those present were representatives of the Regiment from both Scotland and Canada.