Two years ago an area in our front yard was invaded by the beautiful
mexican primrose, here in Long Beach, CA. The flowers are beautiful -
then die out about this time of year, leaving rhyzomes for next year.
I let them grow, but now that they're dying, I'm pulling out the dead
foliage and impressed by the sheer amount of material involved!

In spite of the flowers in season, I'm wondering if I should try to
eliminate this stuff, and if so how to go about it. Or, should I just
mix in a little extra topsoil and nutrients, go ahead and plant the
area with some ground-covering perennials, and let things go until the
primrose's return next spring?

Any advice, war stories, and the like?

Thanks.

Josh