Stormlight, I believe your main problem is in the roots. (there could be others as well). Post a photo of the root area as lifted out of the pot of a few, if you can.

The medium and the container size are not the right choices for you. In my opinion your medium choice should be reserved for the experienced citrus grower only(for reason we see here), and I do not recommend you continue to use it. It seems like you are not using the correct ratio or additive (I believe it is 3to1 and sphagnum moss not peat) It's also possible you have large air pockets in the root zone that are hard to identify. Something that will also help it to reduce the container size. This will help the medium dry out quicker allowing for a better oxygen cycle.

The fact you say you watering schedule is about a week is also troubling, only water when they need water not on a schedule. water when they are dry only. pick up the container and feel the weight to be sure.

What are you feeding the plants? be is specific as you can, PH, PPM fertilizer NPK? BTW the MH lamp will help a lot.

Stodo2k11,
Isn't burning tip is the sign of over fertilizing or too much salt. I just don't understand why that variegated lemon leaves started to curl up? Though the each leave is really thick comparing to kumquat, mandarin, and lime.

RyanL,
The Kufushu kumquat was repotted recently, less a than a month ago. The last green tip is getting darker and starting to wilt. I am not sure if I should take it out and take a few pictures and put it back. I am using peatmoss with 5:1 ratio. Not sure if the moss is the problem. The root ball looks good at the last repot. I know I had root rot the outer outer edge but the 5" diameter root ball looks really good and full. The last medium was just plain sand and clay. It was really hard to remove those material because I had to use alot of water to rinse them out. If I have time later tonight, I will take it out and take a few shots since CHC is easy removal.

Does anyone know why imageshack pictures turn green and pink? It was fine a few days ago.

I don't see any sunburn on the variegated tree. The outside margins and tip is just the variegated coloration. Also where did you come ups with a 5:1 CHC peat mix. That does not give enough peat to hold the proper amount of moisture. It should be either 4:1 (larger trees). 3:1 (smaller trees). - Millet (519-)

That's variegation.

Stoddo, why not? As Evaldas wrote, it looks to be just normal variegation. - Miller (518-)

Variegated Pink Lemon


Shot at 2011-08-18


Shot at 2011-08-18

Variegated Pink lemon drop all of its leaves. I see alot of buds but none of them are burst. for some reason....


Kufushu Kumquat


Shot at 2011-08-18


Shot at 2011-08-18


Shot at 2011-08-18


Shot at 2011-08-18

I do see a few root bud being developed but the last green bud on the tree is gone. Most the limbs are hard dead wood. A few still have their flexiblity. At the soil, I felt moist and it looks moist. This is 5 days without watering. Millet, 5:1 is fine for me because I am having too much problem with water logging. The mix of 5:1 but when i take it out, the top soil is like 10:1 and the middle to bottom is 3:1... All the peats just fall to the bottom between the crack when watering.

The pink variegated lemon is going through the same phase as this kumquat. It buds up lot and lots, drop all the leaves, then the limbs start to brown and dryout out. Should I start using systemic pesticide or antifungal even I am not experiencing it?

Just my 2c

The smaller roots were distroyed because of an a external cause(water or something else) and so the tree was lacking the nutrients and the water he needed.

What would I do with those roots?

I would cut back every tip until I see some new white colour inside the heart of the root, and then put him in a very aerated soil and try to make him a greenhouse from a plastic bag or a greenhouse tent

Good luck to your trees

I have not read about cut back on damage roots. Would other please confirm? I would think cutback would discourage growth or perhap recovery?

If the root is damage, is it possible to spray dilute fertilizer on to tree to see if it'll absorb while the root recover?