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landscape plants for steep slope #751062

Asked May 20, 2021, 12:19 PM EDT

Hello! I'm quite pleased to have found your site! Our Dayton (Washington Two), cedar/brick, tri-level home sits on quite a steep slope, and especially on one side, we're opting to have a large bed to avoid the somewhat dangerous mowing of that area. The bed in mention will have a kidney bean shape, or something aesthetically curving. The large tree you see in the middle of the bed has a lot of roots exposed above ground. The top pine trees with the 5' bare trunks used to be engulfed in honeysuckle, which we took out. Although they are somewhat wimpy looking, we plan on keeping them to balance out the large pine tree we have on the other side of the house. I was initially thinking of some large ornamental grass that could get up to 6' tall to fill in the gaps of the lowest pine tree branches - or maybe some other type of pine trees, or something to fill that space in height-wise? We're trying to keep costs low, so will not be doing a retainer wall. We have access to some large boulders, which i would love to incorporate, but I'm uncertain if we'll be able to get them transported to us. My thoughts vary from having a variety of ground cover, to a variety of junipers, and am concerned about soil erosion. Some plants I had in mind are Blue Rug Juniper, Creeping Juniper, Creeping Jenny, Creeping Thyme, English Ivy, Hostas, Lirope, and Sedum. My goal is to not have it look too patch-worky with too many different type plants. There are so many options, but do you have any better suggestions? How is it best to stagger these plants? Do you have suggestions on a garden design? I have ideas, but worry they won't be the best. The bed faces the south, gets filtered light in the morning, and spotty, direct sun in the late afternoon/evening. Is it best to lay down a thick black landscape fabric first? What type of soil do I then put on top of the fabric, if used? Lastly, should I put mulch, or will that run off? I also thought of using some smaller landscape rocks, maybe something like river rocks?, towards the bottom of the bed in further hopes of preventing soil erosion. Should I use a plant starter before planting plants? Do you have suggestions on where to purchase my plants in my 45459 zip code area? This large bed is just one of many that need a haul over. Do you have someone that could come out and give us an entire yard, front/back/sides landscape design? If so, what costs are involved? Or, do you have any links that provide garden designs on slopes that list the names of the plants? Thank you SO much in advance for listing to me go on, and on, and on....lol. Gardening is my passion, but there are so many things to consider, and naturally, I want to make wise choices that are functional, look nice, and won't break my bank. Thanks again for any feedback you can share!! Laurie

Montgomery County Ohio

Expert Response

Hello Laura, and thank you for your question(s)!

I am happy that you found our site – please feel free to use it as often as you need. We are able to provide researched-based answers to gardening questions, but unfortunately that does not extend to garden design, and we are not able to visit your property. For help with your garden design, you may want to google “garden designers in 45459 area.” I did, and a number of names and nurseries came up in the search. As far as where to buy plants, we are not able to recommend specific businesses, but again a google search will list the nurseries in your area.

I would ask you to consider using native plants when you are planting. Here is a great article and video as to why:

https://www.audubon.org/content/why-native-plants-matter

Here is a website listing nurseries selling native plants. There is a lot of information on this site too about native plants and why to use them.

https://www.ohionativeplantmonth.org/native-plant-sources

A south-facing slopes allows you many plant options, and it seems to me that you may need a mix of sun and shade plants depending on where you are planting on that slope. Here is an article from Penn State Extension defining what “sun” and “shade” mean, including directions on how to determine what you have:

https://extension.psu.edu/planting-in-sun-or-shade

Here is an article from the University of Maryland Extension titled “Native Plants for Sunny Slopes”

https://extension.umd.edu/resource/native-plants-sunny-slopes

and a second titled “Native Plants for Shady Slopes”

https://extension.umd.edu/resource/native-plants-shady-slopes

I would definitely NOT use black landscape fabric. Here is an excellent article on all the reasons why NOT to use it (can you tell I dislike landscape fabric?) from the University of New Hampshire Cooperative Extension:

https://extension.unh.edu/blog/should-i-use-landscape-fabric-keep-weeds-out-my-perennial-garden

In regard on how to prevent soil erosion, I would consult with a landscape designer who is able to visit your site, but here is an article from the University of California titled “Preventing Erosion” that will give you a basic understanding of what may need to be done. (The definition of “moderate, steep and steepest” are industry standards, but please do not use the plants suggested in this article as they are recommended for the California growing area, and would not be happy in Ohio.)

http://marinmg.ucanr.edu/Great_Gardening_Information/Gardening_Tips_Techniques_and_Terminology/Gardening_Basics/Preventing_Erosion/

If you are considering grasses, please consider our native bunchgrasses (big bluestem, little blue-stem, switchgrass and Indian grass) instead of the non-native and commonly used Miscanthus. Here is a great article from the Illinois Extension on native grasses:

https://extension.illinois.edu/blogs/garden-scoop/2020-06-13-landscaping-native-grasses

Adding organic material to a planting is always a good thing but I’m not sure what exactly you mean by a plant starter?

To obtain more information on what an individual plant needs to be happy, I would highly recommend using the Missouri Botanical Garden Plant Finder website:

http://www.missouribotanicalgarden.org/plantfinder/plantfindersearch.aspx

I believe I have answered all your questions (and given you a lot of reading homework!). If you need any more help from us, we are here.

Have a lovely day!

Amy G. Replied May 24, 2021, 8:37 AM EDT
Hi Amy,
Thank you SO, SO much for all this detailed information. I truly appreciate your taking the time to provide links for each of my questions. At this time, I'm thinking it'd be best if I hire a landscape designer. With your information, I'll certainly be more knowledgeable than I was to begin with.

Thanks again!
Laurie

-----------------------------------------

From: "Ask Extension"
To: "Laurie Layman"
Cc:
Sent: Monday May 24 2021 8:37:47AM
Subject: Re: landscape plants for steep slope (#0020993)

The Question Asker Replied May 24, 2021, 4:12 PM EDT

You are welcome!

Amy G. Replied May 24, 2021, 6:01 PM EDT

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