I'd probably snip off the extras, leaving the best looking plant.
I was away for the weekend. Since returning I've found aster yellows in 3 coneflowers. Two of my tomato plants look like they're frying, with brown crunchy leaves. I'm worried that those might have aster yellows, too. It could be just the heat and drought, I've had that happen before in similar weather years.
Our weather forecast continues to be dreadful, with temps of 103° tomorrow, and no rain in the next 9 days.
Karen