Our grapefruit tree has many, many fruits on it. Should we thin or remove some of them to improve the remaining fruit?
Yes, thinning the number of fruit on the tree will help it focus more energy to those left on there. Simply pluck off some of the fruits and even any flower buds remaining on the tree.
When will my grapefruit start to grow? A lot of them split open at the bottom before they ripen. Why?
Citrus splitting is not uncommon, although grapefruit suffer from the condition much less often than other citrus. It is caused by uneven watering, usually a certain amount of drying, which causes the fruit to shrink, then large amounts of water, which causes fruit to swell faster than skin can grow. While you can't stop the rain, you can water when there's a drought. This article has more information: https://www.gardeningknowhow.com/edible/fruits/oranges/oranges-splitting.htm
Just put my 4 foot tall grapefruit tree in the ground. I live in SW Florida and I was wondering how much and how often I should give it water in the beginning? Also, I have an irrigation system that waters 40 minutes each section of property twice per week.
For a newly planted tree, I would recommend watering daily for at least 2 weeks. It is very difficult to overwater a newly planted tree and they need a significant amount of water to become established well. This article will help:
https://www.gardeningknowhow.com/ornamental/trees/tgen/watering-newly-planted-tree.htm
Grapefruit tree took until January to ripen. Now I'm worried that it won't flower as much this season, as there are still fruit on the tree. Should I remove all of the fruit? This is its second yield. It skipped last year but this year was twice the size of the first yield which ripened in October. Live in Houston, TX.
What kind of grapefruit tree is it? Many grapefruit varieties can ripen anywhere from late fall through winter or spring, so what you are seeing may be completely normal - October one year, January the next. And the rate of ripening can vary from year to year depending on environmental conditions. I don't think you necessarily need to rush to harvest your grapefruit. The tree will basically set its own timetable when it is ready to blossom and fruit.
It is a Rio Grande Ruby Red I believe. The fruit is now all ripe. I would say we have a couple dozen still on the tree. The tree blossomed but it was not close to last year and we used fruit spikes. Our Satsuma next to it had a great blossom for the first time this year. Is it possible that the grapefruit will do a secondary blossom once the fruit falls? Or will this be a recovery year?
What do I do to "retreat" my grapefruit tree?
Here is a great link that will help you get started with your new tree.
https://www.gardeningknowhow.com/edible/fruits/grapefruit/growing-grapefruit.htm
I bought my house and I know very little about it. My question is in digging a water well, how far from the trunk? I know that it should be as far as the canopy but is to be started from the trunk the distance from the trunk to tree canopy is about 6 ft?
I believe if you stay outside the canopy of the tree, you should be safe.
If you have the ability to choose your well location, I would most certainly want to keep established fruit trees a safe distance from any possible damage.
From personal experience, we were able to have our well drilled approximately 10 feet away from a large established tree canopy.
My grapefruit tree leaves turn yellow with brown marks. It is not very young tree, but we never have a lot of fruit from it. There's always something wrong - yellow leaves, small fruit, etc.
With the history of poor performance with your tree, I would highly recommend a soil test. You then can determine the correct fertilizing schedule.
Here is a link to help you locate your nearest extension service.
https://www.gardeningknowhow.com/extension-search/
Also some great links about grapefruit tree care.
https://www.gardeningknowhow.com/edible/fruits/grapefruit/grapefruit-tree-not-producing.htm
https://www.gardeningknowhow.com/edible/fruits/grapefruit/growing-grapefruit.htm