Pruning is likely to reduce flowering. I would recommend fertilizing at least once per year. If this doesn't usually happen, then I suspect this to be the case. Is there any other information about your environment that you could tell me? This may help to see what is happening. This article will give you more information on the general care of these: https://www.gardeningknowhow.com/ornamental/shrubs/pittosporum/growing-japanese-pittosporum.htm
Answered on March 17, 2019
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