Lynn I have clipped all of these this year as they've come into bloom, so its all been during warmer weather. I have tried several others and they have either just continued to bloom or have just died out. But it may have to do with when I'm "catching" the plant - I don't always notice that one is about to bloom. Since I wasn't collecting seed (or so I thought!) I mostly clipped the bloom part off
Since I wasn't collecting seed (or so I thought!) I mostly clipped the bloom part off 
