I have a lemon tree that is 2 years old. It has wintered inside and did well last year, but now the leaves are not as vibrant and quite a few have fallen off in the last month. I don't think I'm overwatering or underwatering, and it is in a south facing window. Still too cold to bring outside (I'm in RI) what can I do to help this plant? Thank you Lisa
A little bit of leaf loss is common when you bring outdoor plants inside - the change of humidity, temperature, and light can be a real shock.
If the leaf loss has started after the plant's been inside for a while, it's probably a watering problem. Citrus plants really do need a lot of water, and they often don't get it from the regular houseplant watering round. Especially if the container is big, the middle of the root ball may be completely dried out. Try giving your pot a good soak in the sink or bathtub, and keep an eye out for new leaf growth.
You can read up more on citrus watering here
https://www.gardeningknowhow.com/edible/fruits/citrus/tip-on-water-requirements-for-citrus-trees.htm
And container grown lemon trees here
https://www.gardeningknowhow.com/edible/fruits/lemons/growing-lemon-trees-containers.htm
My lemon tree blossoms seem to have cobwebbing around them, and then fall off. What can I do to treat this, please?
This sounds like Spider Mites.
You an treat the plant with Neem Oil.
Neem Oil is organic and safe for people, pets and Bees.
Here are some links with more information.
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm
https://www.gardeningknowhow.com/plant-problems/pests/insects/spider-mite-treatment.htm
https://www.gardeningknowhow.com/edible/fruits/lemons/pests-of-lemon-trees.htm
How do I know when I need to transplant my lemon tree in a larger container?
If you are seeing roots coming out of the current container, this is a sign to repot.
Select a pot that is big enough for the roots and a bit more room.
Make sure it has good drainage holes.
https://www.gardeningknowhow.com/edible/fruits/lemons/growing-lemon-trees-containers.htm
I planted a lemon tree that was in a pot directly in the ground. Now the leaves are curled up although I give enough water. What can be the problem and how can I solve the problem?
It sounds as if your lemon tree has transplant shock, which is common after transplanting:
Most trees will recover with patience.
Is it better to pick ripe lemons or let them drop off the plant?
You should pick your lemons while they're still on the tree. They'll probably be squishy by the time you let them drop. You can read all about harvesting lemons here:
https://www.gardeningknowhow.com/edible/fruits/lemons/harvesting-lemons.htm
I grew a lemon tree, and it's losing its leaves. How do I stop this problem?
Has your tree been inside all winter? If so, there's a good chance it's gotten dried out. Lemons need quite a lot of water, and it's hard to keep up with those needs indoors. Try giving your container a good soak in the sink or bathtub.
If your lemon isn't inside, or if you've been watering it a lot, there are a few other possible problems. (One is, frustratingly enough, too much water!)
You can read about them here:
https://www.gardeningknowhow.com/edible/fruits/lemons/lemon-tree-leaf-drop.ht
Lemon tree blooming but fruit turns yellow and falls off. Used epsom salts lightly. Had black fungus on leaves and used aspirin soapy water overnight, then flushed with clear water next morning.
Here are some reasons lemon fruit may drop off:
https://www.gardeningknowhow.com/edible/fruits/lemons/lemon-tree-fruit-drop.htm
The black fungus on the leaves could be sooty mold. In this case, the key is controlling the insects that produce honeydew which the mold grows on:
https://www.gardeningknowhow.com/plant-problems/disease/how-to-get-rid-of-sooty-mold.htm