Started my border with a pre-packaged set of plants from Bluestone, very happy with results - but I have several that need transplanting, mostly for size/space issues.
How do you judge the best time to transplant perennials in Fall? Have heard they need six weeks growing time to re-establish, but no one says from what or until what or anything really helpful, so I suppose that's six weeks anytime. And how cold at night will stop growth? I remember at the golf course we started growing in Spring when ground got to 35, never paid attention to stopping growth.
When do you transplant? I'm thinking first part of September here in Denver. Not too late, is it?