The former Yeovil man just joined Boreham Wood, who are looking to put up another fight for promotion.
The manager has had an impressive summer with the Herts side adding well to their squad and Garrard wants to “replicate” their finish in the top seven - and maybe go even further.
Midfielder Smith, he hopes, can help them achieve that.
Garrard told the club’s website: “I am very pleased, because I think that he will bring an energy and a quality to the side. For his age, he has a lot of experience under his belt and he is only 25, but he has played a lot of games in the Football League.
“I outlined to him where we want to be as a football club, and where we are looking to go. He is aware of the work that we did last year, in terms of getting to the Promotion Final and he is aware of what I expect of this side going forward.
“We are ambitious and we want to replicate what we achieved last season. I think that when you mix all of that in with our facilities, which we walked around together earlier – the pitch, the training facilities, the analyst suites, the gym on-sight, etc – it is an impressive club.
“I know that he played here for Watford as well and he was impressed by how much it has improved since then. I think that a combination of a few things convinced him that this was the right place to come.
“He is coming here with a focus and a desire to progress, alongside the already impressive group of players that we have at this club.”