Water requirements for citrus in Bosveld Sitrus at Letsitele area, South Africa.
It really depends on many factors, such as the temperature while watering and the size of the tree. I would say that you need at least 2 inches (5cm) per week covering the entire area under the canopy. In hot weather (over 30 C), I would increase that to 4 inches (10 cm) per week. That is for a plant in the ground. If it is in a container, water daily in weather under 30 C and twice daily in weather over 30 C.
I have what I thought was a lime tree. I picked a few a couple of months ago and used as limes. However, I have neglected them since, and the fruit has turned yellow. They are now segmented and taste like mandarins. Do you think the tree was mislabeled?
It could have been mislabeled, or (more likely) it could simply be refusing to obey the grower's instructions. Citrus freely pollinate each other, and all the citrus we use today are hybrids of hybrids.
Maybe you've lucked out - use the immature fruits as limes, and the mature ones as mandarins.
I have grown them from seed and they are about 1 foot tall now. The leaves also have a sticky substance on them.
The sticky stuff is probably the honeydew excreted by aphids or scale insects. Here's some information on getting rid of them: https://www.gardeningknowhow.com/edible/fruits/citrus/controlling-citrus-scale.htm
I have since put wind cloth around them, fed, watered and cleared the ground of all vegetation. Will they live?
The first step is to find out why the leaves turned yellow. The most likely cause is problems with watering: https://www.gardeningknowhow.com/edible/fruits/citrus/tip-on-water-requirements-for-citrus-trees.htm
There are a number of other possible causes. This article will help you look for other possible causes (this article is on oranges, but most citrus are similar): https://www.gardeningknowhow.com/edible/fruits/oranges/yellowing-orange-tree-leaves.htm
To get the most accurate diagnosis, you can take some leaf, branch, soil and roots samples to a professional, either the horticultural extension service, university, or botanic garden. This link will help you locate the nearest office (if you're in the US.) :
https://www.gardeningknowhow.com/garden-how-to/info/what-is-extension-service.htm
In the summer months, there are these stink bugs on my citrus trees. They start out white, changing to orange and then black. What spray can I use to kill them? They eat the new growths. Have used white oil, but need to do often. Are there any other ways? Thanks.
I like neem oil for food plant pesticides. It is safe for people and beneficial bugs but very effective on pests that eat the trees. After the tree is treated, the tree absorbed the neem and any part of the tree will be poisonous to pests for a few weeks. With white oil, you must apply directly to the pests, so this can make it not as effective as neem. Here is more information on neem oil: https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm
My trees are blooming and I watered them a month ago. Do I need to water them again while they are blooming?
Yes. Ground planted citrus trees should be watered about once a week, whether from rainfall or manually. The article below will give you more watering guidelines for your citrus trees:
https://www.gardeningknowhow.com/edible/fruits/citrus/tip-on-water-requirements-for-citrus-trees.htm
Recently, I grew excited about the idea of starting a bonsai tree. I went to my local park and grabbed as many seeds as I could find. The fruits of my labor seemed to be a big flop, but I didn't let that discourage me. I even decided to try lemons and oranges. Now I have one maple tree sapling, and SIX citrus! The only problem is I have no idea if they were from the lemon seeds or blood orange seeds. Is there any way to tell lemon saplings and orange saplings apart? They're only 2" tall at this point.
My guess from you image is little lemon trees, but they are small and young yet.
Give them some time and identifying should be a bit easier.
Here are links with some images.
https://www.gardeningknowhow.com/edible/fruits/lemons/how-to-grow-a-lemon-tree.htm
https://www.gardeningknowhow.com/edible/fruits/oranges/growing-an-orange-tree.htm
https://www.gardeningknowhow.com/edible/fruits/oranges/blood-orange-tree-care.htm