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Japanese Camellia Struggling


I have this Japanese Camellia that we managed to move from one part of the garden to another approximately 10 years ago due to it being in the way of a new lawn for the kids when we moved into the house. It took some digging up and probably lost a lot of its roots so took quite a few years to recover and flower again.
It has begun looking quite bare the last year or two now and hasn’t flowered. Should I be watering it in the summer months and would it help to add anything to the soil?
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It is the size of the images, if you make the a little bit smaller they will come out the right way.
I do not know how to do it but if another member comes along one of them will often fix it if you can't
So the camellia has been in its new position for a few years now and was okay.
I am not sure but possibly the dry year we had last and this year has been an odd one.
So could be down to watering.
Can you post a close up of a couple of leaves that are dying.
And also give the bark a little scrape on the ends of some of the twigs to see if there is healthy green underneath.
Or are you able to snap the twigs with your fingers, are they dead?
Is that a holly or something growing right underneath it too?
That might be giving it competition, although I do not think it is the main reason somehow.
There is a very healthy looking bit at the base that is still Camellia I think.
So maybe hope.
They do lose old leaves at times as all "evergreen " things do.
But it does look a bit poorly.
I would check the surrounding soil and give it some good waterings if the soil is dry.
Were they overgrowing or overshadowing the Camellia branches.
Sorry for the Spanish inquisition, but the more you can answer the better help you will get.
The colouration of the dying leaves may also give clues whether it might be a iron deficiency which can happen or some other cause/disease.
And finally (sorry) what soil do you have?
If you water thoroughly, then keep adding compost/manure/leaf mould/bark - ie any organic matter, as a mulch, that will help it retain moisture in drier spells. You can cut back the dead top growth, ideally when there isn't freezing weather in the forecast, and that healthy growth at the base will benefit, as the shrub won't be trying to save all the foliage, and can concentrate on that part. You may need to wait until spring to do that depending on your location.
They need to be well hydrated through late summer as that's when the new buds form. Same as rhodos.
I live in west central Scotland - not where that photo is...
2. Plenty of water in dry wearher in the summer when the flower buds sre forming. You may have noticed buds dropping early/
"Have nothing in your garden that you don't know to be useful, or believe to be beautiful."