Use caution when introducing this to your gardens. It is not an invasive species in the Pacific NW that I have been able to discern, and I have not had it get away from me, but be forewarned that it multiplies rapidly and robustly. That said, I find it a very nice filler - it has nice color from early emergence through fall, with yellow flowers midsummer. Blends well with other plants, and is less than a foot tall (shorter in drier regions). It is easy to pull where not wanted, which is always a saving grace for me. A tell-tale comment from a nurseryman when I commented about it to a friend was, 'You purposely planted that in your garden??' Which made me wonder why they were selling it...

Edit: it has now gotten a bit too aggressive for my liking, and I'm in the process of trying to eradicate it from a rockery area. So far, no luck. I've pulled it all clean, trying to get the roots, but it simply reclaimed the area. I'll continue to pull it, although it does lend a soft look to the boulders. I'm guessing it will be a time intensive project to slowly get rid of it all.

Another caution is its milky sap may irritate skin. I cut some back while still in bloom to discourage reseeding and ended up with a rash up both arms to my elbows. It was not terrible and went away in a few days, but others might react differently.

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According to the USDA, this widespread plant can become a noxious weed and potentially invasive in numerous locations and is banned in Connecticut and Massachusetts.

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Propagation by division in spring.

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