Due to the water content of the melon, you don`t need to add any liquid. First put the melon with the zucchini and herbs in the blender. Then add the blueberries. Then refine with a little dead nettle and mint.
Depending on the sweetness of the watermelon, you can add a little honey or vanilla sugar.
One type of fruit should be frozen to keep the smoothie cool. It can be kept in the refrigerator for up to three days, but of course it tastes best fresh.