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6

It is lichen, yes - if it's only excessive on dead branches, that's why it's proliferating, because the wood is dead, although it does occur on live branches or trunks of trees as well, though not quite so enthusiastically. It won't be the cause of the dieback on some branches, it's just opportunistically decided to grow there. You may wish to prune out ...


3

The problem with sandy soil is that while it allows natural rainfall and irrigation to percolate down to the roots the soil cannot hold on to the moisture long enough for the tree to benefit fully from it. If you examine the leaves of citrus you will find that they are often coated with a waxy shiny surface which helps reduce trainspiration but the fruits ...


3

It's lichen and is not a problem. It won't hurt your lemon tree.


3

Yes definitely. The heat will make the plant wilt and this means it has water loss. The plants usually dry up and turn into a crunchy brown before dying. If you provide some temporary shade this will help immensely! You can get a burlap and put it over the tree and this usually is not expensive. If you don't have a burlap you can use a bed sheet and create ...


3

Personally, I would wait. As I noted in a previous question, I treated a clementine orange horribly and it lived for years. It may be that, if you left the plant in the dark, then that is what's causing the leaves to drop, since citrus can take quite a bit of dryness, especially in winter. I'm pretty confident that you'll have new leaves sprouting by mid-...


2

Don't over-think things. I successfully grew a Clementine from seed and kept it for years until it got too large and ugly. In the winter, I generally ignored it (I live in Wisconsin, so it's "winter" something like 7 months of the year). I would put it outside in mid-May - in the shade - and bring it in again in late September. Every time I moved it, it lost ...


2

It is a watering issue. First I will discuss cause, then about way you might be able to save your plant. Both under watering and over watering, have curled leaves when the leaves are completely dead. In the case of under watering the plant dried out. The leaves being the thinnest part of the plant will die the quickest. It would be losing water in two ...


2

Same happened with us. We got a special fertilizer for citrus and brushed the flowers with a little paint brush not used for anything else and we finally got some. Hope this works for you. It's like being pregnant for 2 or 3 years and not having a baby you are waiting for. So exciting when we FINALLY got fruit. haha


2

I have the same problems on my Meyer lemon tree. The deformities are caused by the Asian citrus psyllid. They are little grey bugs that suck on the new leaves. Whenever the bug feeds, it releases a toxin that causes the leave to curl. You can read more about them here. The easiest way to get rid of them is to either hand pick them off or use an insecticide, ...


2

The RHS has an interesting note on nutrient deficiency. Note particularly the comment on magnesium where it indicates that lack of this nutrient in the plant can cause browning of the leaves, but more important that too much potassium can prevent uptake of magnesium. There may be a good amount of Mg. in the feed but if it gets blocked then strange things can ...


2

The basic problem is that it doesn't have any active roots, just the remains of a root system. Earthworms don't eat plant roots, but if you have soil full of earthworms it may have other pests such as nematodes that do cause root damage. I would try repotting it in a new pot (not an old pot that you have sort-of cleaned somehow) and new sterile compost, ...


1

I had a Clementine seedling for years that always dropped most of its leaves every time I brought it outdoors and then again every time I brought it indoors. It was light-related: the tree didn't like going from a mostly indirect-lighted location to a mostly sunny location and vice versa. I got rid of the problem by keeping the Clementine in a mostly shaded ...


1

The little lemon tree will be quite alright after some water has been given. Two or three days will be enough. Important things not to do: don't overwater; do not change the position drastically, a bit of shade (umbrella) is enough; don't fertilize; most importantly: don't panic!


1

When growing plants from seed in an open-pollinated situation we can expect a lot of variability in the resulting growth, as you have observed. It's probably a strategy developed by plants to survive in an unpredictable world. Out in a full sun situation the plant on the far right might go on to be the most successful, but in your darker situation the middle ...


1

Leaf drop: most common reason for this is temperature changes. note: citrus trees go dormant during winter and require different watering schedule then normal. although it seems that you are doing all that you can correctly so far the only thing I can notice is that when you changed your soil you needed to ensure the ph of the soil is suitable for ...


1

I think your tree is dead. The only way to know is to scratch the bark off in various places. If it is green under the bark that part of the tree is still alive. If it is brown, black or grey underneath that part is dead. With clean pruners remove all the dead part of the tree. Then put the tree in a location it can get more sunlight. Only water it ...


1

It is responding a stressor, like not having enough light. Less light is the trigger for trees to loose their leaves in the fall. Those leaves change colour, because the plant cut off liquid to leaf. As the leaf stop making energy it shows it real colour. The colour it has without photosynthesis. Your plant should be at your brightest window and have a ...


1

I hate to be the bearer of bad news, but it’s not your lemon tree that developed the nodules, it’s an armored scale infestation. (And a massive one, judging by the photo.) The ants are likely there for the honeydew, excreted by the insects - although most sources claim armored scale don’t produce it, so it may also be that they prey on them, but certainly ...


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