Sour Grape UK Get ready to pucker up, because this strain truly tastes like sour grapes. A pungent cross between Sour Diesel and Granddaddy Purple, Sour Grape has a very sour, fuel-like scent with fruity aftertones. Introspective and relaxing, this strain is great for winding down with a cup of tea or a low-key evening with friends. Sour Grape UK walks the fine line between energizing and calming, relaxing the muscles while avoiding strong sedative effects. This strain works well for consumers suffering from stress and muscle tension. It’s different from the craft strain “Sour Grapes,” so remember to ask your budtender which one they carry.