Mine definitely grew 1m tall. I had to dig it out and put it in a pot as it was growing next to a rose and swamping it. I have no idea where to plant it now. Wonderful plant with a very long flowering season, but it does grow quite big.
Great news, then. Very easy, just remove the dead stems in late autumn or winter. I didn’t feed mine or give it a trim after flowering (mostly because it didn’t stop flowering until late autumn). Full sun if possible and water it until established.
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