Agreed with Earl on what happens when the soil is cold. Warming with clear plastic can certainly help you to get a headstart, and wrapping the bottoms of the cages is also a great idea. I use row cover.
You might also consider trying a few in containers that are set on concrete/blacktop/etc. Like D., I also find that my container plants will produce a couple weeks earlier than the in ground ones. Soil is warm to start with and the concrete absorbs heat during the day, releasing it at night.
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