help with I.D this spreads into a mess.

something little? ( photo / image / picture from petunia's Garden )






yellow flowers ( photo / image / picture from petunia's Garden )










and continues to spread into this mess ( photo / image / picture from petunia's Garden )

 

Just a guess Petunia, but maybe Potentilla anserina – Silverweed

 

or perhaps Anthemis tinctoria?

 

Is there any benefit to it?

 

A distinctive yellow dye is obtained from the flowers
The leaves are rubbed onto insect stings.
Not sure I would want to make a tea from the leaves, but one is supposed to be able to do that.

 

still really haven't decided if I like it. The plant page says its an herb. My third picture is now all dug up. I moved them and threw some away because they will spread so bad even at their new home. Thankyou for the I.D.