Thanks both.
The plant got blasted by cold over winter, but it seems suprisingly intact, at least above ground.
Humidity: well like many plants in Cyprus in summer, it gets a daily roasting in a fan-assisted oven. The thing is ... look at those young leaves. There is no sign of distress, apart from being late/slow to emerge.
Freeness of drainage is tricky to answer. The soil is a variably-pebbly marl, quite well compacted in this spot. There is a chance that the planting hole I dug is something of a sump. But, again, if it is waterlogged down below, I'd expect to see some sign of distress in the leaves. There is a possibility, however, that it was waterlogged for a while over autumn-spring, causing its roots to rot, and now its growth could be curtailed by that.
I appreciate your thoughts.
Further on names...
Plumeria is named after Charles Plumier, royal botanist to King Louis XIV of France. Although not mentioned much these days, in his time he was an important contributor to botanical knowledge (he discovered Fuchsia and was prodigious in his works), as elucidated here
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https://en.wikipedia.org/wiki/Charles_PlumierMike