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What is this growing in my agapanthus pot?
I found this tall plant growing in among the agapanthus. I do not remember planting/sowing anything else in this pot. Please help me with its identification. Thanks in advance.

Oxford. The City of Dreaming Spires.

And then my heart with pleasure fills,
And dances with the daffodils (roses). Taking a bit of liberty with Wordsworth 
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It does look a bit buddleia-like,they pop up here and there in my garden
Billericay - Essex
Knowledge is knowing that a tomato is a fruit.
Wisdom is not putting it in a fruit salad.
Then carefully remove and pot up the main plant. Once it's happy you can plant it out. If it comes out easily you can plant straight away.
I live in west central Scotland - not where that photo is...
I do cuttings because they really don't seed much here, and the main plants often don't make it through winter unless we get a very benign one. The cuttings will take very readily just now.
I've not got any survivors this year, and I [stupidly] didn't take any cuttings last year, but I found 3 tiny seedlings which had got into the gravel under a mat which is beside my side gate. Potted them up the other day and they're fine. Result!
I live in west central Scotland - not where that photo is...