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Sunny slope; hard to mow

We have slopes that are approximately a 45 degree grade and are difficult to mow. I would like advice on how to prepare the slopes for planting a groundcover and suggestions on what will grow quickly. Both slopes get sun most of the day and one slopes down to the pool, so we are worried about erosion there if we don't prepare it correctly. Thanks!
Submitted by BHGPhotoContest

Because drainage is such an important thing to consider, please consult with a local expert to at least have a plan drawn up for your yard. If you don't, you could have long-term problems that will be very expensive to fix. That said, if you elect to do the actual work yourself, start by killing all of the grass with a non-selective herbicide like glyphosate (the active ingredient in Roundup). As soon as all of the grass is dead, work organic matter like compost into the soil, down to about 8 inches. Then rake the soil smooth and top dress with mulch, like shredded bark or shredded leaves. Pull apart the mulch to plant the groundcover the recommended distance apart. (Frankly, I like to plant closer together to achieve a more dense effect, more quickly.) Some recommended groundcovers are (check with your local extension service-they'll have a list for your area): Ajuga, Creeping buttercup (Ranunculus repens), Crown vetch, English ivy, Goutweed (Aegopodium podagraria), Honeysuckle, Knotweed (Polygonum spp.) Lily-of-the-valley, Periwinkle (Vinca minor), Sweet woodruff (Gallium odoratum), and Yellow archangel (Lamium galeobdolon). Also, consider some natural grasses (not turf grasses) or those adapted to your area.

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