4/5 year old camellia has never flowered or even produced a bud.
Non Flowering Camellia
Certified GKH Gardening Expert
Camellias often take their time when it comes to blooming, even healthy ones. Some varieties are prone to bullnosing as well (when buds refuse to open). This is often due to fluctuations in temperature or insufficient moisture. A lack of nutrients and poor drainage may also be factors. Phosphorus can often help with most blooming issues. Try adding some bone meal to the soil around your plant and see if this helps.