And, how do I remedy this?
This is in response to lower humidity and lower light conditions. This is natural and will continue each year unless you can provide more but not direct light (like a horticultural fixture) and a way to keep the area humid. A pebble tray would help the humidity.
https://www.gardeningknowhow.com/ornamental/flowers/camellia/growing-camellia-in-a-pot.htm
If this is, already, in container then you may transplant now. If this is in ground, and you want to move it, then it is just a little late in the year to be doing so. This should be done shortly after winter begins, or during the plant's dormancy.
This article will help you to plant the shrub properly: https://www.gardeningknowhow.com/ornamental/flowers/camellia/camellia-transplanting-tips.htm
I have a 20 year old camellia tree that for the past few years sets it's buds, but they never open. I’ve fertilized at the correct time, watering, etc. the other camellia trees around it are doing well. Suggestions? Thanks for your help.
This can, probably, attributed to a pH swing, over time.
There are other reasons, but if it is fed often then this is likely the cause. Here are two articles that will address the situation:
https://www.gardeningknowhow.com/ornamental/flowers/camellia/camellias-wont-bloom.htm
https://www.gardeningknowhow.com/ornamental/flowers/camellia/camellia-flowers-not-opening.htm
We have a number of healthy camelia bushes in our garden which grow extremely well in this part of Cornwall. One has got huge and is encroaching on our lawn - we haven't got a large garden and we would like to cut it well back and create a sort of camelia tree? This would give more space to the Magnolia tree which it is blocking. Is that possible. I read on one site - but it was an Australian site that this was possible and good for the bush, but we have given advice from someone else that this is a bad idea. Help please! It's a classic large pincushion shaped bush, it doesn't flower particularly profusely in comparison to our other camlias. We think it is an old bush as the main trunk is probably about eight inches in diameter. Please help us
"Moderation in all things" is good advice, especially with pruning. Don't remove more than 25% of foliage in one year. If you need more drastic reduction than that, do it over a two or three year period. Or remove the entire plant and replace with a younger, smaller plant.
Plants produce the foliage they need for photosynthesis of sugars for growth and sustanance. If you remove too much there is considerable stress induced and possible ramant regrowth, as the plant tries to get back the lost leaf surface and food production for itself.
https://www.gardeningknowhow.com/ornamental/shrubs/shgen/rejuvenation-pruning-tips.htm
North facing but on the west corner of the lot this tree Camelia has taken many years to "grow." Better this year but not leafing has yellow on leavers as seen. Its it fertilizer, sun for.... I am much happier this year than previous 6 yerarlts.
These plants are, notoriously, picky about their environment. In order to see proper growth you will need to fulfill those strict requirements. Here are some articles that will help you to know, exactly, what they need: https://www.gardeningknowhow.com/ornamental/flowers/camellia/caring-for-camellias.htm
https://www.gardeningknowhow.com/ornamental/flowers/camellia/camellia-fertilizer-info.htm
https://www.gardeningknowhow.com/ornamental/flowers/camellia/camellias-wont-bloom.htm
Wetting the soil should allow you to remove the shrub. If the opening is smaller than the container size, then the only option may be to break the container, unfortunately.
This article will refresh you on their care, once in its new home: https://www.gardeningknowhow.com/ornamental/flowers/camellia/caring-for-camellias.htm
I have treated with occasional doses of Miracle Grow camelia/azalea plant food, but does it need something stronger?
Uh oh... This looks like yellow leaf mottle virus.
This is one of many permanent plant viruses that can affect camellia plants, and will never leave the plant. The only thing that you can do is care for it until its demise. Be sure to never plant another camellia in the same spot, or it will suffer the same fate.
Here are some articles that will help: https://www.gardeningknowhow.com/ornamental/flowers/camellia/identifying-and-fixing-problems-with-camellias.htm
https://www.gardeningknowhow.com/ornamental/flowers/camellia/caring-for-camellias.htm