Sasanqua Camellia

This appears to be a Sasanqua Camellia, an evergreen shrub that blooms in fall or winter, depending on the cultivar. (Yours may be the popular ‘Yuletide’.) Sasanquas do best in full sun to part shade and well-draining soil. Growing only to about 6ft. and more compact than it’s larger cousins (the spring blooming Camellia) This camellia needs much more sun in order to bloom well as opposed to the spring bloomers who love partial shade.
You can use an acid fertilizer (suited to rhododendrons) after the flowers are spent. While in bud and bloom, the plant is dormant and does not need fertilizer. Camellia sasanqua drops its spent flowers, so it could be considered “self-cleaning” as opposed to the spring-flowering Camellia japonica, which holds onto its dried-up flowers.