When do you prune and fertilize an orange tree?
Pruning of the orange tree should be done, either, after the fall fruit crop, or anytime during early flowering.
Fertilization is usually done only once a year. How you fertilize will depend on how you are planning to use the oranges.
This article will explain in more detail: https://www.gardeningknowhow.com/edible/fruits/oranges/growing-an-orange-tree.htm
What can I do to help my orange tree with yellow leaves. I have had it for nearly 2 years has never had fruit & doesn't see to have grown very much.
Your lemon tree could be getting too much water or could have a disease that's causing the leaves to yellow. These articles may help you:
https://www.gardeningknowhow.com/edible/fruits/lemons/lemon-tree-not-fruiting.htm
and
https://www.gardeningknowhow.com/edible/fruits/citrus/tip-on-water-requirements-for-citrus-trees.htm
and
https://www.gardeningknowhow.com/edible/fruits/lemons/lemon-tree-leaf-drop.htm
PURCHASED A HOME WITH ORANGE/GRAPEFRUIT TREE IN BACK YARD. WE WOULD LIKE TO KNOW HOW TO GROW ANOTHER TREE. WE LIVE IN hOUSTON
It should be possible to cross-pollinate an orange with a grapefruit and produce seeds, because the grapefruit is itself a hybrid of an orange and a pomelo. Follow these instructions to hand-pollinate the trees:
https://www.gardeningknowhow.com/edible/fruits/grapefruit/hand-pollinating-grapefruits.htm
https://www.gardeningknowhow.com/edible/fruits/oranges/hand-pollinating-oranges.htm
You may also need to take measures to prevent the cross-pollinated flowers from beig pollinated by flowers on the same tree. The resulting fruit should be the same as the parent plants' fruit, but the seeds will be genetically different, and should produce a tree with different fruit if you plant them.
Your tree most likely has spider mites, tiny arachnids that build webs on many indoor plants. Here is some information about controlling them:
https://www.gardeningknowhow.com/plant-problems/pests/insects/spider-mite-treatment.htm
https://www.gardeningknowhow.com/plant-problems/pests/insects/spider-mite-control.htm
https://www.ipm.iastate.edu/ipm/hortnews/2007/12-5/SpiderMites.html
http://ipm.ucanr.edu/PMG/C107/m107bpmites.html
Pruning orange trees what is meant by cutting out the collar of the branch
You actually want to avoid this. The collar is a lump that surrounds the base of the branch. This is here to protect the cut branch from infection.
This article will help: https://www.gardeningknowhow.com/edible/fruits/oranges/pruning-orange-trees.htm
We recently had a uncommon winter freeze come through my area and I wrapped my orange tree to help protect it but I don't think it helped all too much cause it's been about a week and a half since the freeze and all the leaves on the tree have gone yellow and look like the entire tree might be dying?! They are sagging and it looks very unhappy unlike before the freeze when it looked green and alive. The tree is only almost 2 yrs old. What can I do to help my tree and is it too late??
When plants have been damaged by a freeze, it is best to avoid pruning right away even if parts of the tree look dead. Pruning can allow further damage from cold weather to happen, and even if all the leaves fall off, the tree might survive and grow back next spring. The best course of action is to wait until spring to see if the leaves grow back. Then if there are dead portions of the tree, you can prune those away.
Wrapping your tree probably helped it, so it might still survive. If more cold snaps are predicted, use the same technique to protect it. Also see these articles for more information:
http://aggie-horticulture.tamu.edu/newsletters/hortupdate/2011/mar/citrus_freeze.html
http://ucavo.ucr.edu/General/Frost.html
https://www.gardeningknowhow.com/ornamental/trees/tgen/tree-scratch-test.htm
Our oranges do not seem to grow as big as the last few years. They are sweet like in the past but remain a little green on top part of orange. We water 2 times a week same as in the past. Also fertilize the first of every month when we are here. We are here December thru mid April .
This can happen over time. It would also help to add a little sulfur in the form of iron sulfate, as well as a little extra potassium and phosphorus, as sometimes they will need a little boost for fruiting.
Depending on where you are located, Much of the eastern U.S. has been a little cooler this year, which has affected many citrus crops.
This article will give you more information: https://www.gardeningknowhow.com/edible/fruits/oranges/growing-an-orange-tree.htm