Posted: 07/02/2014 at 15:53
I have two dwarf orange trees that sit on the windowsill in the bedroom. They have as much sun as you can get in Yorkshire and I've noticed seem to appreciate the heat from the radiator as they're both green and bushy and one is producing the most beautiful of flowers.
In June one of them suffered a massive citrus feed overdose when one of the little drop feeders I'd been happily buying from Homebase decided to empty itself in the space of not many hours. The reason I'm telling you this is because all of the leafs dropped off over the following week except for two and it looked just like yours. It stayed like this for a month as I tried to work out what best to do. Each time it perked up I would water it only to flood it with feed and any new leafs would drop off again. Could this be happening to yours and why it hasn't perked up with the seasons?
I went to a garden centre and brought special citrus compost and repotted the plant in a pot several sizes up having first knocked off as much of the old soil as possible to remove the contaminated soil (I also ended up buying another dwarf orange tree for £1 as they'd over watered it and its leafs had also dropped off).
I've no idea how often you water yours or whether you use citrus feeds or not (mine only get watered when the leafs start to curl slightly (about once a week) as they both suffered a period of over watering which they did not appreciate and I'm currently only even them a half dose of feed every three months) but giving it some new soil, finding the warmest sunniest place in the house or conservatory and perhaps trimming down any dead wood would certainly be a good start.
One thing I noticed with my orange trees which might be true of citrus in general is that they don't seem to do much for a long time so it might be wise not to expect to see changes in a month. BUT - once they do get going they go crazy!!
I'll try and find out some photographs of my little tree and how it changed if you like.