Bought this - now what is it?

Local plant stall had these for sale 6 for £1. They looked nice and healthy so I thought why not. The lady mentioned blue flowers I think but I obviously wasn't paying attention and can't remember what they are



I'm not too sure about blue flowers now - those buds don't look like they will be yielding that colour?

 

Nope, can't place it, sorry. If no one else chirps up then post a picture once in flower perhaps?

 

Are they asters?

 

I'm probably wrong, but the leaves look like Deadnettle leaves to me.

 

The foliage isn't right for asters, and dead nettles look more...stalky?...in the pics I googled.

Let's see what the flowers look like! It's a mystery..

 

Ageratum?

 

Yes! That looks like it's the one - and fits with 'pretty blue flowers'

Always amazed by how people can id from a photo but glad you did! Thanks!