On 6/1/12 1:02 AM, allen73 wrote:
Gardenias can be damaged by cold temperatures. So move potted gardenias
inside when temperatures drop below 60 to 65 degrees at night. Consider
transferring garden gardenias into pots for the winter if your area
experiences freezing nights in the winter. Use a garage or greenhouse to
overwinter your gardenias. Do not disturb the plant or its leaves while
you're moving it; gardenias do not like to be disturbed or handled.
Fertilize your gardenias once a month, even in the winter. Put a layer
of fertilizer around the base of the plant.

My Gardenia jasminoides 'Veitchii' is in the ground, not in a container.
Only in July-September do night-time low temperatures average above
60F. Last moneth (May), the low remained above 60F on only two nights.
The plant has been in bloom for about two weeks now.

It survived the "great freeze of 2007" (13-14 January 2007) when the
temperature dropped to 32F and my statice (Limonium perezii) died. It
has survived other sub-40 temperatures. With enough summer heat, it
sometimes blooms through the winter, when average night-time lows are
50F and below.

--
David E. Ross
Climate: California Mediterranean, see
http://www.rossde.com/garden/climate.html
Gardening diary at http://www.rossde.com/garden/diary