The hallmark of Sour Diesel https://lamotagrow.com/is-sour-diesel-a-hybrid/ is its pungent petrol-like smell that clings to the buds and lingers in the air after you've lit one up. Where the "sour" part comes into play is open to interpretation and will depend on your own unique sense of smell. The stronger the aroma when opening up a bag of Sour Diesel, the better.