daylily and ants

I have some stella de oro daylily and have grown them a few years. This year there seems to be a lot of small pavement ants crawling around on the blooms. I hadn't noticed this in previous years and there are not an over abundance of these ants in the general area or on other plants in the same vicinity. I don't see any any mounds nearby and in general, don't have these ants much of anywhere else in the entire yard. Is it these daylillies that attract them? Do the ants aid or hamper the plants cycle?
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