According to this shasta daisy page from U of Illinois:
http://extension.illinois.edu/...
"Wet, poorly drained winter soils shorten the life of the plant.......Cut plants down in mid-September to stimulate vegetative growth and help to extend the plant's garden life".
I've had 'Becky' here for many years, it has spread considerably and I took several chunks off it this spring to plant elsewhere. The soil is sandy loam and they don't get watered except during a prolonged dry spell. We don't get a lot of rain here as a rule. It gets very cold and the ground stays frozen all winter. Snow cover is variable. Don't know if tbis helps any. Soil pH would be around 6.8 although it's said to tolerate a wide range so that's probably not relevant.
