have not tried freezing greens yet... I usually go through them much faster and try not to buy as much. My fear is most have a much higher water content than any fruit and that will cause expansion when frozen. I am afraid it will effect the quality and get less volume.
I freeze spinach, collards and kale in baggies...works great and since I do this immediately when I get home from the grocery store, there is no excess moisture. I have only seen collards in very large bags (already cup up), so this works perfectly for them - and they are extremely cheap.
Another tip: when using frozen greens, I don't let them partially thaw(like I do with frozen fruit), or they will become rather unmanageable and flaccid in the NB cup.
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