blumbybaby,

From what I've read, I don't think you have to care for them...at all. Although maybe in your zone they won't be as invasive--or maybe you have a variety that isn't. See the link below.

For more on this plant, do a search for 'oenathera' or 'evening primrose.' (Unlike Google, the Gardenweb search function won't guess when you misspell something.)

Good luck.

Here is a link that might be useful: oenathera

Now i'm scared! This plant sounded to good to be real. Since its out by the street in a dry section of the yard i'm gonna try it for 1 year. If it works out for me I'd like to interplant it with Delosperma "Table Mountain". I tried some of the ice plant a few years ago but it didn't make it thru the winter. I planted 1 of the Table Mountains this year(it says its hardy to zone 4), and if it survives I'll try more.

Many of the evening primrose species are there for a couple of years only but do seed well. If you don't want to be finding them forever then your idea of deadheading is a good one.

Hope your Delosperma works out. However - as it will grow in the whizzy weather of Colorado you've probably got it for life!

treelover is right.
Oenethera(sundrops) is a carefree plant in my zone 5 garden.Each will make about 13 babies that circle it by fall. The mother plant I sheer back by half as it does not rebloom when it's done.

Altho I have no total shade areas to try it in it seems fine in part shade to full sun. As it mulitplies quickly it's a good pass-along plant for the new gardener. Or your next garage sale... which is where I got mine...

Cheers!
Karen

blumbybaby, I hope you got over your fear! They do multiply quickly, but they're an awfully cheerful flower. Yellow doesn't fit well into my current garden, but I grew oenethera at our last house and never minded the extra plants. Plenty to share, or toss!