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Is microclover invasive in natural areas? #721275

Asked September 05, 2020, 7:30 PM EDT

Hello, I read the article about plants for eco lawns at the web link below but it lists micro clover as an suitable lawn substitute with Yarrow. (https://catalog.extension.oregonstate.edu/ec1521/html) I am confused; elsewhere I've read all white clover is invasive. Below our home, there is an open hill leading down to a creek and Oregon Ash/ Doug fir trees. Previously, I terraced the top of the hill and used it as a small vegetable garden. Deer and slugs were my biggest problems so I want to grow more native plants instead. It is now all thistle, dock and other weeds and I want to sow some type of cover crop this fall that 1. Improve soil quality (dense clay), 2. Will not add more mowing labor, and 3. That will benefit native pollinators. I planned to do it in terraced 24" rows alternating a Micro Clover row with a native wildflower mix row, about four rows in total. What can you suggest about a safe cover crop? The three images attached show the hill with some Kniphofia growing that (although not a native plant) is a big hit with all pollinators. They will stay,as will the deer unfortunately, who come up to the house gardens and eat my roses, Cornus shrubs, Symphoricarpos shrubs, Hydrangeas and any type of flower except Salvias, The  bare area in the foreground is where I will concentrate reseeding efforts. Thank you for the input. Cece

Washington County Oregon

Expert Response

Cece:
Clover and yarrow are often listed as weeds because people don't like them growing in your lawn. People managing livestock will often seed clover for forage.

I think clover, yarrow and perennial ryegrass would make a great Eco-Lawn, forage mixture. This is link to a short video on Eco-Lawns, lawn alternatives...
https://www.youtube.com/watch?v=ef-qRLlNvZo



An Ask Extension Expert Replied September 08, 2020, 3:09 PM EDT

Thank you for your response about the clover Alec.

I still have concerns about the potential invasiveness of micro-clover and it escaping into the open space/flood plain areas that are being converted to native plants only. I would like to sow some native Oregon grass and flower seeds in the entire grassy areas this fall. The two attached images show are terraced top of hill area desired for conversion from vegetables and weeds to Oregon natives.

We still fighting back blackberry and European Hawthorne, as well as Tansy, Queen Ann's Lace, and red clover in the mow-able areas.  The second image includes a view down the hill and into the flood plain. Can micro-clover be contained enough for use as a cover crop to build soil quality, then completely gotten rid of? Or is there something better, low enough growing to mow and skip the cover crop step?

Clean Water Services has been doing removal and replanting of forbs, shrubs, and trees for 15 years along the most of the creek. The rest of the grassy area on the hill is what ever wants to grow, not really native, and we continue to mow for fire break and removing seed heads.

Overall this is for riparian habitat restoration, but low growing enough to retrain mow-ability.

What do you think?

Thanks

 






The Question Asker Replied September 08, 2020, 8:18 PM EDT
Clover will help improve the nutrients in the soil because the plant fixes nitrogen from the air. The plant does spread because of its rhizomatous growth habit (underground lateral stems). The plant can be controlled with selective broad leaf herbicides like (triclopyr), which is also used to control balckberry, or nonselective herbicides like Round Up.  
An Ask Extension Expert Replied September 09, 2020, 1:18 PM EDT

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