Hi,
I've got three dwarf citrus trees (three years old, in containers) whose leaves have started to turn yellow. I would think overwatering (which doesn't seem to be the case) or a deficiency of some sort. However, when I compare the pictures of deficiencies from the web, I noticed that the yellowing appears to start from the veins of my leaves, which doesn't seem to be the case with leaf deficiency pictures i've seen online. Just wanted to see if anyone had any ideas. Any info is much appreciated.
Thanks,
Rob

We have NGA members more experienced with citrus than me who will likely contribute later, but have you had cold weather recently and perhaps not fertilized much with nitrogen? See Figure 2 on this page and the comments in the paragraph above it on yellow vein chlorosis:

http://edis.ifas.ufl.edu/ch142

For a more in=depth look at yellow-vein chlorosis in citrus, here is a research article that investigated it.

http://fshs.org/proceedings-o/...

This is a view of my 5yr old?? dwarf tangerine..no blossoms or any sign of them.. under grow lights. It sits in a strong south window. Avg room temp 70dF. Grow lights are on 12 hrs a day. I mist several times a day.



Have I planted over the graft? I scraped away to take ph test - 6.0 - 6.5 (taken with PH Rapitest kit) Not a push in tester.
Soil drains very fast & is always kept moist on meter. Should these lower branches be cut ?




New growth - grows like a weed I fertilize every 3 wks.



This is the fertilizer I use 5.1+2.5+3.75 Citrus Feed from Citrus Pro - imported from Germany - highly reccomended on Amazon.




Another full shot of the 5yr old? tree..maybe it's 6 ?? The straw indicates where it sits I rotate the pot 1/4 turn every 3 wks. Doing everything right as suggested by the growers & forums - NO blossoms ....????

Some trees/plants seems to need that temperature variance to initiate bud formation. That seems to happen with my one and only citrus here. Bud formation in mid to late Spring, and sometimes a 2nd flush after our long, hot summers, when our cool Fall days returns.

Could you possibly post a picture of the tree with the purple grow lights turned off? That way we can see what the leaves look like in natural light.

I agree with Tarev, that you might have to try to give the little tree some variation in temperature, cooler nights for a while, then some warmer days, although the south facing window should take care of that as spring comes along.

On your fertilizer bottle, is there a full analysis of the minor nutrients? Citrus have specific needs such as magnesium and boron as well as the big 3.

For whatever reason, my hubby decided to buy me a dwarf lemon tree this year. Uggh. I don't have tropical climate, I don't have a green house and I kill houseplants (which this is certainly not a houseplant). I'm only trying to keep it alive until spring in March. I read when I got this plant that it will take 3-5 years for fruit/blossoms. Perhaps it just hasn't had enough time yet.

Yes, that's right, Karen, although a dwarf lemon tree makes a nice house plant. Even if it does flower (probably) and set fruit (maybe) this year, you should enjoy the pretty, fragrant flowers but don't let it grow any fruit. (pick off any baby fruit you see) Grow the little tree for a year before you allow it to make any fruit, so that the root system will mature and the tree will have more leaves.

You should keep it indoors until all danger of frost or freezing weather is past. The night temperatures should be above 40 for sure before you put it outside. Give it a sunny spot, some citrus fertilizer (available online) and regular water, and see how it does by next fall. Then, again when the night temps start to fall below 40's or so, bring it inside and put it in the sunniest spot in your house.

Btw, it's better to start your own new thread, so that it's easier for you to come back to it.

Maybe a sodium toxicity?