Foil in plant pots

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Just a thought but a serious one.
I would like to plant a deciduous small tree beside the patio for shade in summer as the heat is fierce just there. I have a number of shrubs/small trees still tiny that would do.
But thought especially given the time of year, I could pot one up and move it around to see what works best or if it works.
But - with the fierce heat and terracotta the roots would bake.
I wondered if there would be some adverse reaction if I used the foil of emergency blankets to put around the inside to reflect some heat.
Weird I know but that's my garden. And I use these foil blankets pegged to a blind to stop me cooking on the settee during summer.
The only normal people you know are the ones you don’t know very well
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We're talking 9hrs of direct sun which reflects off the glass and pavers so often 30°c and sometimes more. Lovely help in cooler seasons but a problem in summer.
I'm not sure if these blankets, which reflect the heat, may do to the roots.
I have a lilac but in need of moving is a Witchazel which s growing like crazy. It may not like the heat.
Some more googling for these things I think.
The only normal people you know are the ones you don’t know very well
I also found this which may be helpful (sorry if you've already seen it and I'm trying to teach you to suck eggs). There must be answers, since many Mediterranean countries have plants in pots successfully.
I think it will also be an increasingly common issue, what with the state of the planet and all, so please let us know if you're successful! with it!
Thanks for the research, haven't had time.
It seems it has mixed effect, quiet complex so it would mean line with foil next to the pot and then line with black plastic.
Using it on the outside would be ugly, blinding in my tiny garden.
Wonder if it would make life easier for the slugs or stop them?
The only normal people you know are the ones you don’t know very well