I agree with Jean. I would use a very well draining mix. I use EB Stone's Cactus Mix, but there is also a good recipe on our forum to "511" mix or "gritty" mix that you can search out. Definitely needs to be repotted, and the roots straightened out if you see they're circling in this small pot. Also, I would consider switching fertilizers. 4 fertilizer applications a year for a container citrus is not nearly enough. Fine for in-ground citrus, but not for container citrus. I would consider using Dyna Gro's Foliage Pro, and use 1/2 strength with every watering. And, I would also supplement with Osmocote Plus (it must be the "Plus" formulation so you have the best NPK ratio along with all the micros, very important). Your tree is in bad shape. I would expect after re-potting and correct fertilizing and watering that you'll see these old leaves drop, pushed out with new flush. Patty S.

There could be a reason...Maybe your tree is starving for nitrogen? Some citrus are just hogs for the nutruient! You can count out Iron, because the newer leaves can noy Another possibility...Are the lower leaves getting plenty of sunlight? Have you let the tree dry out to frequently beyond dry? Seems a deep watering once every 2 weeks during dry spells night not be enough.. Some trees just by nature grow lush and green without much work like my lime and grapefruit trees...Then some such as my ponderosa and lemon trees yellow up on the slightest lack of fertilizer, too high of Ph, to much water, too little, temp flucuations, and so on.. This is just a start...

Erin, are you saying your dogs use your plants as well, a fire hyrdant? Backyard? If so, keep your citrus far away from your furry friends. Pet's can really get into trouble, I know..My dog, an English Mastiff, doesn't really bother my plants, but I've caught him outside, ripping ferns out of the soil. I planted 4 banana trees in the back yard this spring, and 2 mysteriously disappeared. I don't know if he got at them, or our squirrel foes. I do not like squirrels. (S) If you find your dogs wee-weeing in the soil, I suggest you leach them. Urine can burn roots. Since I'm in Il, z5, winters turn arid, especially once the heat is turned on. Your best best is to buy a humidifer..standard size. Home Depot sells standard humidifers from 99-129.00..it's worth the investment. Misting foliage helps and so do pebbles as Pelham stated. Change filters on humidifer, otherwise it's just wasting electric. Sun is important, or however much you get where you live..Last winter was the worse ever here in IL. I lost plants because of the dark. Old plants, over 10 yrs old. Last Sat we went to HomeDepot and bought a flourescent light fixture that'll hold two bulbs. I'm going to buy one warm white and one cool white. The area in which my window faces is south and east. I plan on running the lights via a timer which is another great investment. Also, since I'm in Il, I stop feeding in Oct..Actually, last year I gave my citrus a dose of Osmocote fertilizer as a last feeding..Plus I used Fish Emuslsion on leaves as a foliar insect repellent. Worked like a charm...before that, I didn't feed anything after Oct. I find this especially important if winters are dark. Of all I read on the subject, feeding plants where winter light is lacking will only grow spindly growth. I find this to be true. Pelham has a point about the cold,too..I keep most of my citrus in a small gh in winter, the rest come indoors..the gh can get quite cool during the coldest nights of winter, so that's another reason I stop feeding. One more important issue is watering. You do not want soil to stay wet..It's important citrus get a hearty drink, enough until water seeps out of drainage holes, but soil should dry between waterings. Too much water and you have to worry about rot and insects, such as fungus gnats, (for one.) That's all there is to it..Toni

I tried bringing the plant outside a few times but it seemed to suffer a little since temperatures go from 47-90 within the same day, and so I brought it in, but I could put it back out if that would be better for it. The plant gets about 5-7 hours of direct sunlight (its by a southwest facing window) and I haven't fertilized it since I've had it such a short amount of time and the nursery put slow release fertilizer in it. I keep the pot elevated and empty the drip tray if there's any water in it to make sure it doesn't rot from sitting in water.