Mary, the "low tunnels" work very well ! Last year I purposely bought extra onion sets in the spring and kept them in my fridge until fall, then planted them, thinking I would get some late onions... until I realized that those onions were never going to "bulb" with the shorter daylight hours
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So, I covered them with a low tunnel and they not only survived the winter but gave me what I considered bonus onions for quite some time... in fact, I still have a few left to use! This year I had some leftover onion plants (which I started from seed in late winter), that have been in their pots all this time... I'm going to put them in the ground, set up a low tunnel, and hopefully get more bonus onions next spring.
It's really pretty amazing how much difference that small amount of protection makes!
