Since my climate has a killing winter that we must prepare for, right now is a great time to be picking leaves and freezing them. Ice cube trays help if you are mashing the leaves and freeze in either water or more tea. Ad to smoothies or soups or?
Blanching a bunch like spinach, cooling quickly and freezing in zip locks is also a great way to put up greens.
I like to add a variety when freezing greens. Since Red Beat leaves are good for us plus lambs quarter,and mustards, turnip greens, fresh dill or more herbs all together is a taste of summer in the middle of the winter! Do not forget to add good for us oils or fats since the vitamins absorb best with their help.