The Tropical Fruit Forum

Good for that tree.  That is why there should never be a  hurry to remove "dead" wood.

Brian my front exhaust fans and rear intake vents are all at mid height.   For 10 years I called on the Colorado, New Mexico and California greenhouse industry when I worked for a large agricultural chemical company. All greenhouses have there exhaust fans and intake vents at mid height.  Never seen a greenhouse with them at ceiling height.  You don't want exhaust and vent high.  You want to retain the ceiling heat to use during during winter and use roof fans to blow the heat back down to your plants. In the northern hemisphere, the greenhouse north wall loses both heat and light.  The greenhouse would be much better off if you  insulated the north wall using those silver sided polyurethane insulation boards.  The silver coating reflects all the sun's rays back into the greenhouse.  The plants love it. The two most important greenhouse items are heat and light.

Brian,  your greenhouse looks just great.  Consider putting a couple ceiling fans in the top to push the hot air back down to the plant level during the winter months.  This reduces the temperature gradient between the inside top covering and the cold winter weather outside, therefore your heat lost to the outside air through to film is greatly reduced.  It helps keep the inside temperature warmer, and the temperature even throughout the greenhouse.  I have three 20-inch ceiling fans that blow throughout the day and night during the winter.   Spray a surfactant, Tween 20 is the common one to use on the inside walls to keep the greenhouse from dripping.  Great job -- congratulation on a job well done. 

Congratulations Luak your grafting was top notch. I tried to be selective and send you two sticks that were in excellent condition. 

Tangelos do come true from seed.

Fresh citrus for eating, such as grown in California  nets the grower between $17 and $20 for each 40-pound carton, while oranges diverted to orange juice production, such as grown in Florida get about $185 a ton, which equates to about $3.70 for 40 pounds,

Laidback, all the tree needs is time.  It will fill out..

https://www.buzzfeed.com/venessawong/this-is-what-floridas-devastated-citrus-groves-look-like?utm_term=.mwvWBq5qyJ#.anGbeapa7J

In east west orientated greenhouses the sun pulls the plants towards the south, because only the south side of the plants receive sun throughout the fall, winter and some of the spring.

Tom I grow them in either 3 or 5 gallon RootMaker containers.  It really doesn't t seem to make much difference which size container I use.  I grow new plants from slips that grow from the sides of mature pineapple plants.  After breaking the slip from the mother plant, let it set on top of the bench for 3 or 5 days to develop some callas,  then stick it in the growing medium, where it will start to root.  In a year or so when the plant reaches approximately 3 feet wide it will develop a pineapple.  I let them remain on the plant until they turn yellow to insure a high sugar content.  The fruit sold in the supermarket are normally sold while still green.

Of course for citrus trees you don't need pollinators.  To cool my greenhouse during the summer months I use what is call a wet wall.  It works great in Colorado, a state with low humidity.  Keeps my greenhouse around 80-F even on the hottest day.  Cooling a greenhouse during the summer is much more difficult then heating the greenhouse in the winter.

http://www.greenhousemegastore.com/product/16600/greenhouse-cooling?gclid=CjwKCAjwjJjOBRBVEiwAfvnvBMB7KhBK29SavmphTviSq-7mFmHsUIhUiRgnern3Cq_YFkAAthN2PxoC5XUQAvD_BwE

I know the suggested planting distances of (commercial) Minneola, Navel, Valencia, Lemon, Meyer lemon, Tahiti Lime and Key lime, but not Flying Dragon.  I would expect that Flying Dragon would be something close to a Key Lime which most growers recommend 10-ft apart (will take a long time to grow to full growth).