Sub-tropical help

Since we're all sort of off medit-plants these days, I might as well get my questions in:
1. Brunfelsia nitida.  I smuggled a small Logee plant to Greece in my carry-on last Spring.  Since then it has quadrupled in size and been promoted to larger pots twice.  It flowered in early October and smells heavenly.  Question:  can I risk letting it overwinter outdoors in a sheltered courtyard?  My large and healthy gardenias have no trouble at all thriving in this same area.  We only have a couple or so frosts on a normal winter, and they don't penetrate to this area.
2. Aglaia odorata and Cestrum diurnum. (Also transported here in my carry-on at the same time).  Did very well all summer, thrived and flowered.  Should I plant them in the ground now, or wait till Spring, or not at all?  Cestrum nocturnum does very well in the ground here, but diurnum is unheard of.
3.Tibouchina urvilleana 'Edwards'.  Also from Logee, also transported here in the same manner,  two Springs ago.  It survived one winter outdoors but hasn't prospered...grown in size but losing its leaves to a drying-out from the periphery inwards.  No flowers.  I've had it in a shady spot through the summer heat.  Is there anything I can do to help it ? or should I give up and leave it to its doom.
TIA
Cali Doxiadis
Corfu, Greece
 
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