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Your garden is looking lovely, Rudi. A lovely place to sit and enjoy the flowers.
Agastache hybrid - Around here all sorts are sold at the local nurseries as perennials. For us they are short lived, so I just grow them as a seed line annual.
meanie,I love the photos from your garden. I'm back on dial-up for a few days so they up load slowly. Worth the wait.
I'm intrigued by Impatiens niamniamensis. Is it hardy outside for you or does it need protection? A reseeder?
Our native soil is rocky clay. The Agastache do not reseed in it, but do in the sand beds where I grow "alpine" type plants. In the sand the seedlings can be a pest, and the plants can become perennial. Now I am growing them in the "vegetable garden" as annuals. I do have to gather the seed and get it started every year. I do make some effort to keep the colors separate (but not a lot). The bees and hummingbird like them so there is still a fair amount of crossing between the different colors. It does make the next generation interesting.
Deffo not hardy - it turns to mush at the merest hint of frost. I just take cuttings in September (very easy) and plant out the following year. Worth the effort as the difference that growing them in the ground makes is considerable.
Robert, About your epilobium canum : how much frost has it resisted?