I think I found them by accident, before realising their usefulness. Fortunately I wasn't mean enough to eat them.

The two remaining veggies are in a house and a shop respectively, both in Lanilor Lane. The house is the first on the right as you enter the main part of the street coming from the direction of the market square, the one with the steep steps leading to the front door. The tomato is upstairs. The shop where the pumpkin is loitering is about halfway along on the left.
I agree with Larian being one of my favourite developers thanks to ED and FoV, which are right up there with the top games I've played. In terms of glitchiness, having played Bethesda's games I thought it seemed as stable as can be in comparison! But if that's being damned by faint praise, overall I found it very good in that regard, especially as they're prepared to put the effort into getting out bugfixes quickly and have been very responsive.