It looks like Mexican Petunia,
image from southwestnursery

image from flowerpicturegallery

I have no affiliation with them.
It is supposedly very invasive. It looks like the only methods of control are
- pulling them out, but it can leave roots which will resprout
- herbicide
If you are planning on planting it -
To slow down and restrict the spread of the plant, bury wood planks approximately six inches thick around it.
A larger Mexican petunia should be planted in a pot and placed in an established garden. Before the plant needs to be repotted, the roots will expand within the pot and let it to blossom wonderfully for years.
From How To Control Mexican Petunia