I am growing some lemon trees in pots and started them at the beginning of the season I live in NJ). How long should it take to actually see a lemon grow? Years? Plants are maybe 4 inches tall now.
Healthy Lemon Trees can produce fruit in their 3rd year.
If started from seed it will take longer than an established grafted Lemon Tree.
Here is a link with more information.
https://www.gardeningknowhow.com/edible/fruits/lemons/growing-lemon-trees-containers.htm
Our lemon tree is beautiful and has around 15 yellow lemons on it at the moment. We removed around 50 lemons last week and now all the beautiful dark green leaves on the tree are all falling off. It is close to having no leaves on it at all. What has happened? Is it dying? We fertilized it around a month ago.
Leaf drop is a common problem in both lemon and lime citrus trees. Here is an article that you may find helpful: https://www.gardeningknowhow.com/trees-shrubs/lime-tree-leaf-drop-why-a-lime-tree-is-losing-leaves.htm
It is likely stressed, either from heat or a watering issue. Normally it is caused by letting the soil get too dry. Citrus trees are funny, because they hold onto their leaves when they are under watered and then drop the leaves when water returns. You need to keep plant evenly watered at all times, especially those in containers, to avoid this. This article will help: https://www.gardeningknowhow.com/edible/fruits/citrus/tip-on-water-requirements-for-citrus-trees.htm
Can you please advise me what I can spray on my 'Lots of Lemons' Lemon tree to stop the grasshoppers from eating it?
Diluted orange oil (1 oz per gallon) is effective on grasshoppers, but if it is not working well enough, consider combining it with neem oil. It works on pests in a different fashion, so the combination should cover all your bases. Here is more information on neem oil: https://www.gardeningknowhow.com/problems/pests/neem-oil-uses.htm
This article has more suggestions for grasshopper control: https://www.gardeningknowhow.com/plant-problems/pests/insects/grasshopper-control.htm
I have two lemon trees and an orange tree at the foot of my garden on a lower level. I would like to put in a retaining wall and fill the area with soil, which would mean having the soil possibly up the trunks of the trees to a point 60 cms above where it is now. Will this damage the trees?
It is possible it will damage the trees. That much soil could suffocate the roots below and make it difficult for the trees to survive.
My lemon tree leaves are pale green. It's 2 years old and although this year it had about 1 dozen lemons on it, the lemons had no juice. It's about 4 ft high.
I've listed several great articles for you that should help you pinpoint the issues and help you grow lots of lemons!
https://www.gardeningknowhow.com/edible/fruits/lemons/how-to-grow-a-lemon-tree.htm
https://www.gardeningknowhow.com/edible/fruits/lemons/hand-pollinating-lemons.htm
https://www.gardeningknowhow.com/edible/fruits/lemons/lemon-tree-not-fruiting.htm
https://www.gardeningknowhow.com/edible/fruits/lemons/learn-about-fertilizer-for-a-lemon-tree.htm
How do we know when the lemons are ready to be picked from a container grown lemon plant? There is no lemon smell emitting from the plant as yet.
Lemons are ripe and ready to pick once they have completely turned yellow. However, slightly green-yellow ones can still be picked and will normally ripen off the tree, provided they are large enough. They should also be somewhat heavy feeling and hard with a ‘glossy’ look to them. If it’s kind of squishy, you’ve waited too long. The lemon should also be about 2-3 inches in diameter.
My lemon has set fruit but fruit seems really slow to size up. Any ideas?
In addition to lots of water while fruiting, the tree may also benefit from some fertilizer. These articles have information on how to fertilize your tree: https://www.gardeningknowhow.com/edible/fruits/citrus/fertilizing-citrus-trees-best-practices-for-citrus-fertilizing.htm
https://www.gardeningknowhow.com/trees-shrubs/learn-about-fertilizer-for-a-lemon-tree.htm