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Not grown from seed, bought as small plants.
Not had any issues with them growing amongst other things, apart from they have got so huge that they are shading things out. There are some nice little euphorbias under one of them that are now completely in the dark so I'm not hopeful.
Do yours just outmuscle nearby plants or do you think they are one of those things that put out chemicals which suppress other plants? (Can't remember the name for this behaviour)
lemonade
A2theJ
Same thing happened with mine this year. I'm not sure why.
It appears that you have no issue growing things near the echium. Is that right? Mine have always seemed to kill everything near them.
Finally... are yours grown from seed? I had to go to an open garden in peckham last year, to get mine.