Q.frangipani
3 frangipanis from cuttings all same source, healthy and flowering but have no scent.

Downtoearthdigs
Answered on March 21, 2017
Every year the plant blooms the fragrance gets stronger. The scent is also strongest at night.
https://www.gardeningknowhow.com/ornamental/flowers/plumeria/growing-plumeria.htm
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