By mid-Summer, Spring's eager growth can seem like hubris at best. By July, the first weeks of drought and dog-day heat will have scorched those fragile leaves and flowers. Those plants will, wisely, have packed it in until next Spring.
But what if, just now and then, you could extend moist and sheltering conditions right through to Fall? Here's one perennial that's worth the work: It peaks in Spring—but then again in late Summer.