Arugula is a wonderful green. It sends spinach blushing to the corner when it comes to calcium content match. Arugula can be harvested almost all year long where I live. It wilts a bit in the summer heat and might vanish under snow for a break, but it is always one of the first greens up in the garden. And it packs a punch. If you are not used to the sharp taste of arugula, add in some red leaf lettuce until your palette welcomes its tang. Adding a spoonful of fresh grated beets and carrots will add in more sweetness too.