Answer: What a shock!
I know it's hard to be patient, but hang in there! The
Night Blooming Cereus (Hylocereus undatus) has some
special requirements to make it grow and bloom. Like most
members of the cactus family, the plants need to be 3-4
years old before they're mature enough to bloom. Flowering
is also stimulated when the plant is slightly pot-bound. And,
they bloom on new growth. I'm sorry to say that by giving
the cutting away (I presume this was new growth), you've
given away the part of your plant that was most likely to
bloom. Usually a cutting would need to mature before it would bloom, but in this case the bud must have laready been set and nearly ready to open.
General care for your plant include: average warmth from
spring to fall, but keep cool in winter (50F to 55F degrees).
Bright light to direct sunshine, especially in the winter. Water
in the spring and summer by thoroughly wetting the soil and
then letting it dry out before watering again. Use tepid
water. Slow the frequency of watering in late summer, until
by fall the soil will be kept mostly dry. Water only to keep
the plant from shriveling. Keep the plant slightly potbound.
In the spring begin watering more frequently, and new
growth (and blooms) should follow. I hope this helps!
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