Convulvulus? Ipomea?

The pot must have gotten a stray seed, but it is an annual (aka Morning Glory), and shouldn't be a problem. It isn't that invasive type.

Thanks Wylie. I worry that it's like bindweed which my new next door neighbours seem to be cultivating. They planted some very tall, skinny conifers which are enclosed with bindweed and bryony. All I have to do now is wait for all the seeds to drop into my garden!

The bad one is a darker shade of blue. Some people fly tip the stuff up the street from me and in wooded areas. Now the areas are ruined as it scrambles up the trees and choking the paths.

Pretty one some plant I ve bought have anothe plant come up I think it from the nurserys who pot them up
I would keep in a pot I spathise with you with your neivhbour bind weed good job you have nt got it fromy neighbour the church you would be worried I ll put a photo on to show you what my neighbour the church has and comes into my garden.