this runs along my curb. now end of june I've trimmed the dead flowers off, but it looks ratty. I'm concerned the 'lawn service' in their zeal to kill weeds in the grass may have damaged the sedum just by spraying too close. does anyone know if herbicide can harm/kill this plant. according to my service, their products kills lawn weeds and does not hurt perennial beds. this is a first for me and wonder if I haven't done more harm than good....tho if u saw my yard u would say its 100% improved.