> Did the hole have concrete sides also?
No. Apparently the root "pruning" *depth*
was sufficient along with the then-"cheap"
labor of the gardeners in branch-pruning
was enough to keep the trees manageable -
the soil was warm enough for them - since
there would be no really cold 'weather' where
they 'lived' inside but what's underfoot for
humans would still be too cold for the trees.
With what I've read and learned on my own
about fruiting, the additional light is necessary
to also 'fool' the trees into thinking they are
closer to the equator (and twelve-hour or
whatever daily daylight *they* need to make
up their daily/seasonal heat-light requirement).
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