Thanks for the photo. They don't look like Eucalyptus to me. Where did you get them from? Did they not come with a label? Did you sow them? Does the foliage have any particular smell?
I was given some seeds which had the aroma of eucalyptus and they came from some 30' trees. I am sure they didn't get mixed up with some other seeds. I have some left so will try again. These plants however are doing great in my greenhouse just don't know what they are. Do you know?
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Google image of echium pininana seedlings
Had a look at echium different leaves here is a close up of some larger ones I planted on
In the sticks near Peterborough