The Queen's Flower tree, Lagerstroema speciosa, a fast growing, deciduous tree with beautiful lavender blooms is thriving and growing in the ground after one full year in coastal Southern California. Both in containers and in the ground, it lost it's leaves on schedule and put out gorgeous new foliage. The Queen's Flower trees are doing well even after the lows of the last winter (28 degrees ) .
Alpinias such as this Kimi Raspberry only survived in the greenhouse (minimum temperature 48 degrees). All the large plants outside in full sun and in the shade house (overhead protection but no heat) are dead.
However, the Indonesian Wax Gingers seem more cold hardy but still would not recommend overwintering in temperatures below 45 degrees.
Dwarf Yellow Poincianas are growing vigorously from seed but have yet to go through a "normal" winter here in coastal So. Cal. 
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