Between a rock and a hard place

Erigeron compositus, also known as Dwarf Mountain Fleabane, Cutleaf Daisy, and Trifid Mountain Fleabane, is native to western North America, Greenland and eastern Canada.

Flowering nicely in a trough, framed by, rather than growing in tufa rock this little daisy is easy to please here. This one is a nice soft lilac colour, in the wild they vary and can be much paler.