I'm gonna say it... Verbascum are better than Fox Gloves and they're better than Delphinium. They're just absolutely beautiful plants that flower for a longer and more sustained period than most spires. This mix has some beautiful colours included and the plants will keep coming back year after year!
I do very little to my Verbascum. I sometimes deadhead but I generally leave them to it. I don't find they self-seed very often sadly but the plants do seem to return year after year!