Hi Caparazon, Not sure about your potting mix but we
use a very loose mix here in S.Calif.
3parts Seedling Bark
1 part large/med orchid bark
1 part horticultural charcoal
1 part sponge rock.

Since you mention that you don't have any good roots, be
sure to stake your plants well, they want to feel secure. Also don't
use very big pots they like to be cramped.
Your outside temps sound fine. You will have to wait for new
growth & so will take about 6 months to get established again.
Good luck.
--
Cheers Wendy

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caparazon wrote:
Thank you to everyone.

I take note.
Would you keep them outside (minimum normal nights temperature here is
8-10 C) exposed to the fresh autum wind and direct morning sun (as
they were when I found them) or would you put them inside (15 C at
nights)?