I received a somewhat chlorotic looking Meiwa via UPS yesterday. Watered it with a solution of 24-12-12. Then I noticed the chlorosis, so sprinkled the soil with Osmocote 19-6-12 and Dynamite 13-13-13. The later has the trace elements that the first two lack.

I've read that iron deficiency is a common cause of citrus chlorosis, and the Dynamite has 0.20% chelated iron. So should I just wait and see how it does, or is there anything else I might want to consider? The soil is equal parts CHC, perlite, and Miracle Grow potting mix.

Thanks for any info!

Rusty nail?

All of the fortunella type of citruses and their hybrids will always have some form chlorosis when the season cools down, all of mine showed me so. Grafted or not, they're showing it every year when the season approaches winter and won't be over until it warms up in early summer. I have some grafted over navels where the navels never showed any yellowing, but the grafted fortunellas did. I've tried everything I've got, but no effect on removing that one. I think it has to do with their cold hardiness, similar to color change during the winter time. But amazingly, you do nothing, early spring to summer, all of those mottled yellowing will be all gone and the fortunellas turn their dark full green colors. I am strongly suspecting that this is induced by temperature that has influence on metabolism and one strategy of cold hardiness. I am inclined to think this way based on my experience with agro-ecological systems.

But in tropical places or warmer climates, when yellowing are observed, it would be due to real nutrient deficiencies or toxicities.

Has anyone else in zone 9 keen enough to observe these characteristics of inground fortunellas?

Unfortunately, adding this or that element, or this or that fertilizer, in an effort to hopefully find a cure for some unknown deficiency can often make the situation much worse by overdosing the tree.. Your tree does not have an iron deficiency, therefore, the tree did not need iron. On citrus an iron deficiency appears on the NEW leaves, showing green veins with no green boarders attached to the sides of the veins on otherwise a yellow leaf. The deficiency symptoms for manganese is the same as iron but with green bordersattached to the veins. However, I would recommend that you do nothing. Just feed your tree with a good fertilizer that has trace minerals, and the problem should take care of itself. Fertilize a minimum of once a month, twice a month is better. However, now your tree has a lot of slow release fertilizer, which causes a difficulty with adding more nutrition. Most fertilizers do not contain magnesium, therefore you will need to apply that separately by dissolving 1 table spoon of Epsom salts in a gallon of HOT water, and apply the cooled solution to the root system. Do this approximately 3 or 4 times a year. Good luck to this tree. - Millet (1,367-)

Tomorrow is ----Casualty Friday

That is a nice looking tree, like how the green contrast with the surroundings.

Actually it looks like a painting. - Millet (1,366-)

Today is: Casualty Friday in the USA

I agree. The background looks like a standard studio wall paper!

The illusion might be due to the focus on the tree that is perched on a balcony with the beautiful desert in the backdrop! The potted tree look beautiful too! Excellent contrast. I'm not hard to please.