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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)
It's a tree echium, I've got three and this is their second year so they were meant to flower, but they haven't done that, they've just grown enormous.
Lottery as to whether they'll survive the winter but if they do, they will surely flower next year. They are cool as foliage plants anyway though