shorter hours of sunlight + cooler potting media triggers dormancy ...when longer hours of sunlight + warmth return next spring ...new growth will resume
over watering will kill adeniums .... watering when dormant will kill adeniums ...
water up to the point - where leaves yellow and seem to drop off in mass ....this can be misleading... so, keep an eye on stem tips .... if stem tips are bare of new growth, or any growth at all .....stop watering ....together, yellowing leaves and zero stem tip growth, signals dormancy has began ...
while plants are in dormancy ...do not water ...do not fertilize
plants may shrink or shrivel .... the caudex may get noticeably "slimmer" ...leaves may appear "deformed" or "crinkled"
mark the day on a calendar ... then wait 90 days .... if no new growth ...wait another 90 days ...repeat if necessary
if any sign of new growth emerges ...then only water those plants with new growth - but only water, less than, the total volume of pot ....if plant is in a pot about the size of 1 cup measuring cup - water about 3/4 cup ...no more
some plants loose all leaves, some might keep half ....others might keep all of them