You have hit on a number of problems. Many I have been mulling over.
A hoop house has limitations, especially the wide fluxuarion in temps day to night. A larger structure likely to have a narrower swing.
Collecting 1 gal milk jugs to fill with water. Saw one source that spray-painted black to increase the temp.
Grow bags or more likely large pots. Which leads me to smaller mature plant, like dwarfs.
Still see black plastic as valuable under the pots.
I have thought about making a second floor over the ducks. Meaning when ducks are shoo'd into their house for the night, they could provide some level of added heat for plants set on platform above.......
lots of room for error for sure. lol
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