Len, Many thanks for your response. The pots are actually rectangular troughs, 1.2m long x 0.5m wide and 0.6m tall. So called premium potting mix has been used. The Meyer and Arnold blood orange have been in the troughs for 12 months or so. I have 7 other citruses (including another Arnold blood orange) in smaller pots which are doing very well; these have been fertilised and watered similarly but receive a little more sun (on part of the plants at least) being situated next to a north facing wall, under an eave. I do not know the root stocks though none of the plants were bought from the dwarf section; when I have asked, nurseries usually say that the root stocks are semi-dwarf. Sincere thanks!!

Thanks Laura and Hendo13. I may be ahead of myself this year, since some of my plants are at the same stage as this one. I had checked a couple of months ago and noticed its root system was disturbed, so I had packed it back down good and tight. This is a tree I have had for at least 5 years now. Fertilized the same as all 30+ plumeria that I have. Laura, it sounds like the one you described. I am tempted to cut all the tips, and unless things don't improve within the next month, I may do that. Since it has always been a very robust plant, and heavy bloomer, last years strange growth (or lack of) concerned ms! My other 2 plants from the same tree are doing fine! They were the second plants to broom this year, second to my Lemon Yellow (C Star calls it Lemon Yellow wish I knew if it was called by another name elsewhere...strange big leaves with ripplinv edhes...tall grower and heavy bloomer). Anyway... I think I will continue with my usual fertilizing schedule and see if it progresses. Thanks for the reassurance. So far this year the following plants are blooming; Guilott's Sunset, Lemon Yellow, unnamed tree discussed, small yellow blossom, unnamed as well, Hawaiian Flag, Lipstick, and my most recently opened, one of my favorites, Intense Rainbow. 8 total so far. Miami Rose is coming soon, also a favorite. Intense Rainbow (last year's)

The leaves make the food/energy for the plant. The more leaves, the more energy. Making fruit takes a lot of energy for the plant. If it has to decide between the fruit and it's own health, it will drop the fruit. Your tree truthfully has just barely enough leaves to support itself, but not enough to make fruit. Here, check out Tom's thread. He grows inside also, and his are some of the healthiest I've seen grown inside. Very leafy. http://forums.gardenweb.com/discussions/3785984/spring-grow-light-fever?n=21 And here's Laura's thread. She has them outside in the warm seasons, but keeps them inside in winter. http://forums.gardenweb.com/discussions/3852778/my-trees-are-so-happy?n=10

This tree was outside the whole summer. I really think the unusual cold august contributed to the flush and flowers I see on all my trees. No other explanation.