[NepNut]

Good question and I can tell you eventhough there's no flowering season for nep (as far as I know), I do think certain weather condition some how will trigger neps to flower more readily, like the weather I'm experiecing right now in my area (inconsistent weather like rain and shine).

However this doesn't mean the flower will be fertile or receptive. That will mainly depending on the health and age of the plant. In oder for a nep to flower, the nep must be a mature plant (ie. going to and already producing uppers in most cases).