A species that will show their best in a community, these thrive in mixed gardens and in meadow settings. They generally grow to between 2’ and 3’ tall and, if isolated in a garden without some support, they have a definite tendency to topple over.They will keep blooming in their toppled state, but won’t show their pretty purple-blue blossoms to their best effect.
I’ve found that they will tolerate a bit of shade but really are at their best with six or more hours of sun each day. Morning sun especially, since hot afternoon sun seems to hurry the closing of their morning blooming flowers.
I haven’t found that they are very particular when it comes to soil type but they do seem to be happier with consistent moisture, or at least a good drink now and then in periods of extended drought.
From a spread standpoint, I’m put them in roughly the same category as daylilies (the garden varieties, rather than the fast-spreading orange ones), with individual plants growing considerably taller than they are wide but patches eventually forming.