@Sooby
But I've brought my own daylilies indoors for the winter several times for various reasons - no aphid population developed over time. Perhaps they just can't handle the winters here where it can get very cold with little protective snow cover (as was the case this year until fairly recently).
I have 38 pots inside this winter and I probably have had 25 or more pots inside each winter for a number of years. I bring some of them inside in early October, some more in mid to late October and this year I brought some inside much later at the end of November. Most are growing under lights at slightly below normal room temperature (19C). Nearly all those have developed large populations of aphids. A small group had all their leaves removed and resprouted from their crowns - they do not have any aphids. Another small group is in a deep alcove next to a north window. The warmest they get to is about 13C during the day, perhaps 10C at night. They have not had any aphids. I suspect that the aphid populations are affected by the temperatures at which the plants are grown, as well as the initial population sizes when brought inside. Presumably the later the plants are brought inside the smaller the initial aphid populations.
