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[Gene GeRue <genegerue AT ruralize.com>]

> > 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 -

I am thinking that dwarf trees would stay of manageable size. (A quick 
Google search reveals many sources of dwarf lemons, limes, oranges.) I'm 
also thinking that radiant pipes buried in the soil at the appropriate 
depth would do the job for heat. I would use insulation board as a 
perimeter heat enclosure or just let the heat migrate to adjacent areas for 
growing tomatoes and other wintertime delicacies.

 The [radiant] flooring was for 'fooling' the trees into thinking
> 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.

So what we need is the subsoil temp in Florida or here in Phoenix, some 
subsoil radiant heating pipes and a remote temperature-reading device to 
operate a thermostat and water valve.

> 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).

On this cool, cloudy Phoenix day, I am thinking that citrus trees, like 
apple trees, also profit from a time of dormancy.

When we bought this property the only citrus tree was dying, looked 
pitiful. I pruned, deep-watered weekly and fed and there are now four 
lovely lemons slowly gaining color and lots of new foliage. In addition to 
the fruit, Chris and I delight in the lush spring scent of the blossoms of 
all the citrus trees here. Imagine that scent wafting in from an attached 
greenhouse. Might make us giddy, might make us do crazy things.