I don't know of any.... it's just a plain thug here. Planting them is basis for serious arguing here (I am understating this) . I have never heard of anyone using it for medicine, but you may look up Mexican sources.

I bought a primrose, and it hated heat and sun, and quickly died.

Daisy: I looked in every Herbal book I own and only Oenothera bennis is listed as an herbal.

Mexican Evening Primrose, aka Pink Ladies and Showy Evening Primrose, is Oenothera speciosa, aka Oenothera berlandieri and "Siskiyou Pink"; and no where is it called an herbal.

Thanks all. After doing my own research, I've come to the conclusion that this plant MUST GO. Shame, it's very pretty, but it's spreading like wildfire, and if it's useless, it has no place in my garden.

ksrogers: It's in full sun, in the heat of subtropical Australia in midsummer, and going gangbusters! Perhaps a blowtorch would kill it?

It's planted here because it LOVES 110 degree heat and drought. Anything from Mexico has to be able to tolerate extreme heat. Too much water may kill it, but if it lives for Daisy then that's not the case. :o) There are few plants that I would never plant and vinca and oenothera are two of them. I'll buy the e.p. oil if I need it. :D