By Pinky
kent,
United Kingdom 
erigeron karvinskianus (Mexican fleabane).
If I cut them back now will they keep flowering? They are getting very long and straggely
17 Jul, 2014
yes a quick hair cut will help keep it flowering but don't dead head the very last ones as they will set seed and allow it to spread [if you want more of it that is :o)]
18 Jul, 2014