Anyone know what this is?
This plant has appeared in my garden from nowhere, so I assume its some sort of weed, but it seems to be turning into quite a pretty one if it is.
It has Jagged leaves (Pic 2)
Long thin stem (Pic 3)
Teeny tiny pretty yellow flowers (Pic 1)
If it is a weed I would like to know if it will do much damage to leave it there, before it starts spreading seeds.
Thanks for any help :)