Just about every citrus tree I have, and all varieties (50+), inside my greenhouse, both in ground and container grown, are presently flushing and blooming. One would think it was spring. The only two trees that are not presently blooming are a Poncirus and a Kumquat. I always try to maintain a constant temperature in the greenhouse at 55F (13C) night and 75 (24C) Day. -Millet

How those citrus trees can survive these nearly tropical conditions during short winter days where there is no enough sun light?

Radoslav, Colorado, a state in the western part of the USA, normally has 300 sunny days per year. Because of Colorado's average altiture of 6,800 Ft. above sea level (2,072 M) the intensity of sunlight is quite strong, even during the winter. Therefore, the amount of sunlight during the winter months is no problem, but also due to the state's high altitude the winters can get quite cold. As a side note: because of our high sun intensity, Colorado has one of the highest levels of skin cancer in the USA. - Millet

http://www.tchd.org/pdfs/update7.07_skin_cancer.pdf

Thanks for info . Now, it gives a sense.

I had an Orage tree outside till 2 weeks .. now it is sprouting inside like mad ..

I have noticed that when we get a cold blast come through & I move my container trees into the dark garage they all seem to burst into bloom.

Because my trees are inside a greenhouse, there is no need for them to ever go outside. They stay inside the greenhouse year around. The greenhouse is heated during the winter, and air conditioned during the spring and summer. It stays at 75 F day 55F night inside year around. BTW currently the outside temperature is 4F (-16C) and the trees are warm and cozy. - Millet

LOL ...

I wonder where else in the world people would cool Citrus trees, but in the USA ...

My "Navelina" orange tree is also in bloom... You can check out the pics thread.

link

Igor

I'm having some citrus blooming as well, Millet, that's interesting that you're mentioned this. This is a little early for us here in California. My Aust. Finger Lime just had a small bloom, and my Ortanique and Buddha's Hand are also setting a few blooms. Those are in pots on the patio. In the ground, my Thornless Mexican lime is blooming (again, not that unusual), but so is my Gold Nugget, Yosemite Gold, St. Teresa lemon (new, so really excited to get some blooms), Ortanique, and my Ponkan. Not sure what's up, but nice to get a few early/off season blooms. Hopefully, we'll not get a frost between now and spring.