mustard greens.Mustard? What do you mean mustard?
I have to disagree.... in all but the most extreme places things can be grown outside most of the winter. It simply takes being resourceful in order to do so and most people simply give up thinking that it can not be done. I am originally from upstate ny and we grew most of the winter up there ..Totally depends on where you live. I live in a zone 4 growing zone and NOTHING grows this time of year unless it's in the house or a green house under lights.
My mom however lives further south and at a lower elevation and she had flowers last year in Dec and January.
Before you start any growing you need to find a USDA Growing Zone chart and determine your correct growing zone.
If you live in places like Florida, GA etc you might be able to grow alot of things outside this time of year, but if you live in Michigan, Iowa etc, you had better plan on indoor or green house growing this time of year.
NO one implied that one could no do it. It was just mentioned that an individual would need something other than the bare ground unless you live in the deep south. Just because I used the term " green house" instead of Protection is no need to create a harassive environment for a simple miss use of a term. It's far more counter productive to FAIL to mention the types of protective equipement you use in order to grow such plants in the first place.To simply outright say that one cannot do as such is counterproductive to the cause that i assumed we were all here for in some way shape or form. .