I just started making green smoothies. I have used kale and spinach (fresh from the produce aisle) -- both are good, but the kale is a much stronger taste. IMO you really can't taste the spinach. It's fairly sweet and doesn't have a 'grassy' taste that some might find unappealing. I throw a handful in any fruit smoothie and it tastes great! Even my 3 yo and 15 mo love 'em.