Skipper Steve O'Melia said: "Matt Simmonds was our man-of-the-match. Overall we had a good game, played well and a fine end for 53-year-old Fred Tucker who is retiring."
Argaum had made the early running and Chris Millar jinked his way out of trouble for Saltash.
Simmonds threw a wayward pass at the other end to deny his side the first blood but within minutes was over the line from a tap penalty move.
Argaum's driving maul saw Paul Venkort stopped short at the other end and further pressure from the Wanderers tested the Ashes defence.
On the 20 minutes a penalty fed along the line from Millar found the gap for Simmonds' second with scrum-half Ben Jones converting.
Ashes had the territory and Simmonds completed his trio of tries inside the half hour when a clever kick over Argaum dropped in-goal.
Right winger Ryan Jones dived into the left corner with Jones potting the conversion and on the half-time whistle had added the extras after Ashes' pack drove over.
Trailing by 33 points, Argaum brought Will Moulder on to steady their front row and Wanderers spent the third quarter inside the Saltash half, the Mattus brothers being a constant threat.
Ashes had introduced club chairman Steve Moss among the replacements but the fresh legs couldn't prevent Argaum's Stuart Courtman from finding a hole in the defence.
The restart took Saltash into Argaum's half and with the pack driving forwards Ashes' Andy Hughes came up with the ball on the half-hour. Full-back Kevin Noyce potted the kick.
Ashes continued to press the Argaum line and replacement Noyce, on for Grant Brettell, weaved through on the stroke of full-time, with his conversion bringing the Pedrick Cup with a 45-5 victory.
Argaum spokesman Richard Belli said: "We battled well and stuck at it. We had some youngsters and will hope to build on this next season."
SALTASH II bid to make it a double for the club against Plymouth Argaum Wanderers in tonight's Pedrick Cup final at The Rectory (6pm).
Saltash are at full-strength, while Wanderers blend youth and experience, including the father-and-son combination of hooker Chris Sillitoe and son Chris in the pack.
Argaum spokesman Richard Belli said: "The captain Jason Burdett has done a magnificent job this season. Tonight's occasion is just reward for that effort."
Wanderers: D Burt, C Sillitoe Snr, A Eskriett, J Pitt, C Burton, C Sillitoe Jnr, I Mattus, P Venkort, P Duff, S Howard, D Wills, S Quarterman, J Burdett, M Townsend, T Liberson. Reps: W Moulder, S Chapple, D Parmenter, D Pegg.
Saltash II (meet at 4.30pm at the club or 5pm at The Rectory): G Brettell, R Dover, C Jones, M Simonds, P Hurrell, C Miller, B Jones, S O'Melia, D Dell, F Tucker, A Horlock, J Gallimore, S Gale, J Westaway, D Jackson. Reps (from): A Hughes, K Noyce, S Moss, D Case, P O'Melia.