Marilyn,
These were planted in last spring and thrived over the summer and into fall. The soil is a bit sandy and well drained. I have been watering the garden in the hot weather. Everything else around these has come up very well. I think the problem stems from not having any insulating snow cover last winter. I was worried that I would lose a lot of plants because of that, but it seems only a few casualties. Even my butterfly bush is now showing signs of life, so I figured once that finally started, the Agastache would as well if they were going to.
