Answer: If the leaves are half brown and half green (as opposed to having spots) then water stress is the problem. Not enough water going deep enough to satisfy the roots. Since it is on a slope you might need to dig a watering basin around the base of the plant (to create a level area for water). Then fill the basin, allow to drain, then fill a second time. Do this once a week and you should see a big improvement in the health of your plant. You can prune your camellia back to remove some of the affected leaves and to encourage healthy new growth that will cover the remainder of the affected leaves. Best wishes with your camellia.
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