Camellia leaf burn
With the recent sustained freezing temperatures, a couple of my camellias have suffered what looks like leaf burn (see photo attached). First, will you please validate that the brown leaves are leaf burn? Then, more importantly, is there anything I should do and how critical will this be for the long term health of the plant?
This looks like winter injury or leaf burn on your camellia. There is nothing you need to do now. Affected leaves will drop in the spring and you should see new growth. You will have to wait and see if the flower buds are affected. Here is more information on winter injury. Deep watering will also encourage deeper rooting during the growing season which will help reduce damage from moderately dry periods and frozen soil. http://extension.umd.edu/hgic/winter-damage-trees-and-shrubs