OK this is probably really daft, and there's probably a very simple answer which I simply hadn't thought of - but I'm NOT green fingered at all.
A few weeks back DS1 came home from nursery with a bean that he'd grown at nursery - when it arrived home it was already about 2ft tall!! (felt a bit embarassed as his was by FAR the tallest bean in the nursery). I duly repotted it (it was in a tiny pot) and put it in the greenhouse with a large cane next to it as I did at least know it would need something to 'grow round'.......anyhow this cane is about 4 1/2ft tall..........and the bean has flourished and is nearly at the top of the cane.
What do I do when it reaches the top - do I just leave it, or do I need a bigger cane?? DS is VERY proud of his bean, goes out to the garden to look at it everyday and I'd hate to ruin it