Hi Deneba,
There is alot of friends on this site that are a lot smarter than me, but I will share my opinion with you. I seem to observe that alot of people are having all these problems with their trees in doors, in the winter. What that tells me is that our trees crave more sun than what they recieve. Even if we use supplemental lghting. They thrive outdoors in sun. So this is your possible problem!
I do not believe it is a fertilizer problem. So do not feed until you see it start to revive or you will hurt it further. Preferably in the spring. Very few plants need fertilizer in the middle of winter.
Check out your roots, if they are white and healthy then it is not a watering issue, which most of us have once we cut the amount of sunlight they recieve.Most of us seem to over water them when the daylight is shorter, unless we have them planted in a well draining soiless mix which you can make. Al's mix is wonderful!
The only other possibilty I can think of is pests. If you examine your tree with a magnifying glass and see nothing, I wouldn't worry of that either. If you pass the roots and pest test, then I would say it is, LACK OF SUN. Real SUN. Lights will help it thrive ,and I would look for ways to give it much more than you already give it. But lites can never replace sun. That is why they do so well in greenhouses too. LOTS of sunlight there.
As for humidity levels, I am not to sure, considering the trees I have brought to work and put in big windows, are getting NO humidity, but lots of sun, are doing ten times better than the ones I have at home with lots of humidity but lots less of SUN..I have great fruit and flowers on these at work. I do have lots of artificail grow lite bulbs. I mean the ones you buy at greenhouse supply stores..At least 450 watts and higher. And mine seem to do the same thing yours are doing to at home anyways. Maybe I should keep my lights on longer, but my energy bill would go through the roof!
Just try to keep them alive, even if the tree doesn't do as good as outside and listen to the advice of our experienced friends on this site. You will be able keep them thriving, even if they miss the outdoors.:-) Happy citrus growing..

Hi Deneba,

Sometime I wonder if any one even reads these threads after they ask questions. I hope you saw this, and I hope you were able to benefit from what I shared with you on my previous help.
I am starting to notice their is not enough responses to all the help we are giving others.. Whe evryone is involved and communicates with others who help, this makes this forum sucessful.So who knows if what we share is even read or appreciated by a majority here.
I feel like I am the only one always spending time on this forum, other than a couple of good close friends that have been terrific on their concern to be there for us to.
I wish more would respond to the help of others. It motivates us to want to continue to help.I feel like I only want to stick with the ones willing to show they appreciate my words and with the ones that show a sincere interest in keeping in touch.:-(
I hope your happy, and that I was able to help you with my time..Take care..happy Citrus growing. Keep your eyes on spring!!! :-)

Meyer mike,
I think a lot of people read the articles, even though they don't post. I treat each entry like an archived journal and keep coming back to the thread that interests me. I usually read a few posts and figure out for myself what I need to change/find out, etc. I usually hang out in the forum where something is giving me the most grief. Orchids are my favorite, but in the summer I cruise through most of the forums, in the winter, I usually focus on the house plants forum. Since I have been thinking about my fertilizer routine for my lime tree, I am here.
As for the citrus, I do notice that the leaves wil sometimes shrivel like the photo. Citrus are evergreen and should not do it all that often, but mine seem to do it in the winter especially. I completely agree, the lack of light. Like you, I keep my citrus trees here at work in a 35 foot long atrium in our office lobby. It grows and flowers all year, and I give co-workers big juicy limes to take hime. The sun here is really the thing that keeps my lime going. Although, I noticed new leaves that grow in the winter (indoors) usually are 2x the size of other outdoor-grown leaves on the same plant. This I believe is the result of indoor growing with shortened daylight hours and cannot be fixed. Even here, where my lime tree is, the supplemental flurescent lighting is very bright. Leaf drop might also indicate inadequate humidity or a drying root ball. I am amazed at how much water the 7 foot lime tree soaks up in a day. I mist my tree once or twice a day and keep up woth the watering since you never want the root ball to dry out, especially in dry indoor air.

Nice....I I'll bet you can't wait for Summer too right.
I love to see the transfromation on my plants from indoors to outdoors!!:-). Seems like whatever ails them is cured within days!!!
Do you think growing Citrus in the south would give us more pleasure? lolol
Just pray our plants make it through their darkest time, like we have too, and watch them rejoice in the warmth of spring and embrased by the heat of the sun!!....:-)
Take care and happy citrus growing to you!!!
Mike