Cor @DeborahJane you`ll have to keep an eye on that - to be in the Guiness world record book it needs to be taller than 30ft 1 inch - that one was grown in Germany in 2014.
Nightshade is a thin vine that rambles and climbs. It has small yellow and purple flowers and red berries and it is very poisonous. Nothing like what you have. I agree it looks like Sunflower.
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