A few random musings from an insomniac's brain :) ...Well, I think that a lot of problems in containers comes from a poorly-aerated soil, so that's where my train of thought goes immediately. It's hard to know how often you might need to water something, since that depends on ambient temperature, humidity, water retention characteristics of the media, how well colonized the soil is by the plant's roots, container choice, etc. But if you have a soil that you only need to water every *two weeks*--that is a container media that holds too much water and the roots are drowning. Yellowing leaves and leaf loss is a symptom consistent with that (though of course it is normal for any citrus tree to have some leaves yellow and shed when they have outlived their life expectancy, and yellowing/leaf drop is not always very specific to one cause).

I would suggest looking over the following link--very good info.

Is it also possible that the tree is getting underwatered? How are you deciding it is time to apply water?

HTH.

Here is a link that might be useful: Good stuff here--read me please

rickjames,

Thanks for the response. I do think this plant would do better if I planted it in the ground, but I rent, so I don't want to do that. I have been letting it dry out between waterings and then I water it pretty thoroughally. Maybe that's not frequently enough?

Anyway, I tried another fertilizer (just some Miracle-Gro fertilizer I had in a watering can) and some of the leaves turned green overnight, so now I think it is not getting enough nutrients--although it could be that it needs to be re-potted. I'm confused because I bought citrus fertilizer that claims it contains enough nutrients for any citrus plant, but apparently not....

Anyway, at least it's getting better for the time being. Thanks again.

~ Joy

Here is a link that might be useful: My blog

Also, yellowing leaves can mean an iron deficiency. You might try getting some "Liquid Iron", making a brew according to directions and then treating the soil with that. I've had good luck doing this in the past. Also, watch out for too much water.