Dario,
thank you for this information.
Interesting our sun is hotter than yours due to the angle of the earth to the sun, as you get closer to the equator, but our humidity only goes as low as 45% and then back up to 70/ 80 %
at night [ generalised figures ] We don't cross 80% due to island breezes and this also modifies our heat, as well as patchy cloud cover.
We have tried to explain to folk on-line that mainland China has no tropical zone. The lowest listed is zone 10. Maybe on the beach you can get slightly warmer. Both K's and my grandfather have explained that Canton had 4 distinct seasons, but their summers were hotter.more humid than the Caribbean's.
http://www.backyardgardener.com/zone/china.html
So we have been trying to get folk on your side to factor that in when growing not only the Fukien tea, but the Serissa, Sageretia, and a good many plants from China.
Texas seems to go to zone 9a and 9b. Still a chance of frost and way colder than we can go at our low of 70 to 65 deg.F Tropical trees are supposed to be able to just handle 55 deg.F for a very short period. Possibly less resistance in pots.
This is probably why there are so many dead Fukien teas and Serissas.
On our side Fukien teas are happiest when they are root bound, and can control the soil. We water early morning and early evening, but morning is the only time when you need to make the pot drip. Early evening is more to keep the soil moist as the breezes are active at night as well.
Good Morning.
Anthony