We had to pull out a large gardenia bush due to remodeling on our home. Can I replant this gardenia in another spot? Will it survive? What do I need to do in order to save it?
It may or may not survive a move. Gardenias don't like change and the larger the plant is when you move it, the more likely it is to die. That being said, you can improve its chances of its survival by making sure to dig up as much of the rootball as possible. Move it quickly from the old location to the new one. Have the new location dug up and ready for the plant even before you dig it up from the old location. Then, trim the plant back by 1/3-1/2 once it is moved and water it frequently.
I think that you can easily plant it, Believe In Dissertation Coaching but be sure to add fertilizer to the pit and water the bush well after planting so that the bush will take root well.
I just planted a 3- gallon gardenia shrub outside. Now the leaves are starting to turn yellow but there is no sign of disease.
There are many, many reasons a gardenia will start to turn yellow. This article will help you pinpoint some of them:
https://www.gardeningknowhow.com/ornamental/flowers/gardenia/helping-a-gardenia-bush-with-yellow-leaves.htm
I have 3 bushes, just planted this past spring with a possible frost coming over night. I covered the bushes with plastic bags, but only the top leaves. Will this help and is it ok to leave the trunk uncovered?
First, I would not recommend covering a plant with plastic for frost. Condensation builds up under the plastic and that can harm the plant in the cold. In the future, cover it with a sheet or blanket. The plastic can be placed on top of that.
Other than this, it will help to keep away damage from light frosts to do this.
How much should we water outdoor gardenias?
Outdoor gardenias planted in the ground need about 2" of water a week. This includes rainfall.
My Gardenia has tiny white bugs on it. The leaves are falling off and turning brown. What do I use?
Sounds like the problem may be mealy bugs. Here is an article or two that you may find helpful: https://www.gardeningknowhow.com/ornamental/flowers/gardenia/gardenia-pests.htm
https://www.gardeningknowhow.com/plant-problems/pests/mealybugs-white-residue-on-plants-leaves.htm
I purchased a gardenia bush in May and it bloomed profusely all summer. It is still nice and green. Can it survive a NE Ohio winter?
Most gardenias cannot survive outside in areas that drop below 15 degrees F in the winter. If you live in an area that gets colder than this in the winter, you will need to bring the plant indoors.
If it's in the ground, dig it up with the rootball being as wide as the widest part of the canopy. I would trim back the plant at this time too, to help it adjust to a smaller root system. Then acclimate it for bringing in the house. Container plants should be acclimated as well. This article will help:
https://www.gardeningknowhow.com/houseplants/hpgen/using-pesticides-and-other-chemicals-on-your-houseplants.htm
I grew up with Gardenia bushes and now appreciate my mother's efforts. I planted two gardenias in very large pots on the north side of our home (Fort Worth, Texas) the summer of 2008. They get sunshine but not too much, as we have pecans that shade them. This summer they flourished as I fed and watered them regularly. Now they are very, very unhappy. One has some yellow leaves and the other droops like it has not been watered in years. Help!!!
Yellow leaves on gardenias can be caused by several things. This article will help you with that:
https://www.gardeningknowhow.com/ornamental/flowers/gardenia/helping-a-gardenia-bush-with-yellow-leaves.htm