There are numerous versions of green smoothies all over the virtual space. There is no hard and fast rule what you can add or subtract in this blessed drink. There was a time DG was downing celery sticks with other greens and her friends were giggling. Then came a time it was just berries and greens then at another time apples were cheap. So it all depends what is available and what is convenient.
Wash and towel dry:
Kale, Spinach, Dandelion, Cilantro
Strawberries, Blueberries, Banana(peel the banana)
Greens come in huge bunches so you don't have to use everything at one time. Use few sprigs of each and save washed and towel dried greens in zip lock freezer bags to freeze for later use. I recycle all freezer, sandwich or what ever plastic bag has a zip on it.
Blend fruits first for creating a base then one by one start adding greens along with little water at a time. Start from 1st button on the blender and keeping going until the last. This formula works every time coz' one doesn't have to think twice.
Even if you use few sprigs there will plenty of green stuff. You can save it in Tupperware or mason jars and freeze it for later use.
A drink of 16 ounces of green smoothie should make up for 2-3 servings of RDA (recommended Dietary Allowance). Personally prefer drinking it as a nightly snack to make up for any missed servings of fruits or vegetables.