No, canned vegetables contain sodium. Frozen vegetables, on the other hand, don't. It is the potassium in vegetables and fruits that help the kidneys get rid of sodium through the urine which in turn lowers b.p.
Leafy greens (e.g. spinach, romaine lettuce, kale ) are high in potassium.

jadillow...anything that is "preserved" and that includes canned fruits and vegetables, contain a ton of sodium. You must become an avid label reader!!!! You will be as shocked as I was when you realize how much sodium is in things you wouldn't normally suspect.