To kill the vegetation use something like Roundup because it will kill the plant but the roots remain unless you get a gully washer. I would germinate the seeds and plant in pots before putting them in the ground then you will be guaranteed of plants.

Here is a link that might be useful: Propagating Perennials

I haven't been impressed with the vigor of Roman Chamomile enough to try it on a slope, so you may want to try a patch first and see how it does. Thyme and mint hold on for me, as do daylilies and all kinds of grasses. Is your slope in sun or shade? Do you plan to mow it or let it be?

I wouldn't kill the existing vegetation until you can replace it with a sure thing quickly. In addition to suggestions you get here, you might pick up some great ideas by looking in other peoples' yards. Garden tours are great for discovering plants that work in difficult sites in your area.

My slope is in sun. My neighbors are looking at what I am doing to see if they want to follow my *lead*...

Will Chamomile compete with weeds? Do I need to worry about the roots in the ground from the dead vegetation (killed by roundup)?

Thanks again.

Roots killed by Roundup should be no issue as long as you are using original formula of Roundup with Glyophosphate being the only herbicide in it. Other herbicides can be more persistent. You can usually keep seed on a slope with an erosion control blanket. I know nothing about the chamomile plants you are thinking about so I can't help there.

Thanks for the reply Bob64,

I will have to post what kinda of success I have with this endeavor....

I believe the prevailing opinion is that slopes are best maintained with a mixing of different plants with different sorts of root systems, rather than a monoculture.

We are putting in a mix of native shrubs, native grasses, and a handful of hardy native prairie perennials for color. All that is required is once-a-year cutting back of the grasses and perennials.

A word of caution: here in PA (I live in PA as well) it is difficult to keep groundcovers weed-free.

I don't think there is an easy solution to slope-planting here. However, the end result can be dramatic and rewarding.

I have Roman Chamomile in my herb garden. it grows great, but the plant is very fragile. I can't see it competing with grass at all.