| Paph delenatii (check the capitalization patlee, it's a species so no capital on delenatii - I corrected your post) comes from southern Vietnam. In nature they experience cool winters, around 10C (50F) for winter night time low with about 27C (80F) winter daytime highs. Summer averages are around 17C (63F) summer nights, and about 34C (93F) daytime highs. In addition to the cool winter nights, notice the extreme diurnal (day/night) temp difference (17C, 30F) year round.
South Vietnam is especially wet in autumn, in Sept-Dec (March-June in the southern hemisphere) then drier (but not dry) the rest of the year.
I have probably close to 15 P. delenatii in various stages, seedlings up to previously bloomed plants. I've been growing them for various lengths of time (10-14 months). I am getting good growth, both leaf and root, but no blooms yet. I am growing mine indoors where the lowest night time winter temp is about 15C (60F).
In nature it flowers in late autumn at/near the end of the rainy season so it is possible that either the autumn temp drops, the autumn increase in rain or a combination of the two initiate blooming. After the first of the year, I'm going to try growing some of them outdoors here in Melbourne to see if I can get them to bloom.
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