There are lots of species of Echium, ranging from a small British native, to the massive Canary island Echiums. Which do you mean?
I guess you mean Echium pininana robiwan. They are wonderful indeed. I don't think they would survive in my garden but I do grow the native Echium vulgare or Viper's Bugloss which the bees go bonkers for
Fran IOM said:
I had one last year which was beautiful until the storm uprooted it. I now have three more on the go but they were attacked by sawfly earlier in the year so I am not sure how they will turn out. Got rid of the sawfly so they have started growing again. One of my favourite plants. @Lyn and @Guernsey Donkey2, if they don't mind me saying, know a lot about them and will be able to give you whatever information you need.