Maybe plastic with holes for each stem could be used to insulate the aerial airspace from the root airspace and then a small heatpump could make that 10F differential with relatively low power cost.

I wonder what the baseline is btwn the two ;

How dependent on heat is the "fruitful" nature of the plant vs the subsitance livability of the plant?

i.e.

Min temp for survival vs min temp to fruit and the balance between... What is the coldest one can keep a plant while maintaining max fruiting output?

Just hear me out ;

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What if the human genome code diffs based on pro-longed temp differentials in host biology (meaning if the in-utero mother was in a prolonged colder climate, which altered the passed on DNA)

So"cooking" dna is a real thing, May one be able to "calcify" information into DNA based on temp? Science fiction galore!