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Monday - July 21, 2008
From: Hamden, NY
Region: Northeast
Topic: Erosion Control
Title: Erosion control in New York
Answered by: Barbara Medford
QUESTION:
I am in zone 5/4 New York and I recently purchased a house with two erosion problems- 1. a seasonal stream has cut a gorge about 20 'deep X 40' long.Mature hemlocks are toppling into this hole. it is semi shade, moist clay soil. 2. A fill bank of nearly pure clay,mostly rock at about 80 degrees,full sun. On this site,erosion is so bad that a mature stand of Polygonum cuspidatum (Japanese Knotweed) has been unable to advance,though I am in continual battle with it at the top of the slope. After a winter the gullies are 2' deep and 100' long. I have considered wattling willows but the bank is dangerously steep. I do have the capability to grow 1000's of plants to a gallon size Thank youANSWER:
Wow! When we get canyons like that in Texas, we call them state parks and charge admission. Of course, it has quit raining here, so we haven't had any new parks open up recently.
To be honest, we think this is probably beyond the scope of what we can do with native plants, or maybe any plants. Our specialty at the Lady Bird Johnson Wildflower Center is the care, protection and propagation of plants native to the area in which they are grown. It sounds more like you need a firm of civil engineers than advice from gardeners. If mature trees and Japanese knotweed are unable to hold their own against the erosion, we can't think of anything else that could. This doesn't sound like a feature that could have been hidden beneath a neatly mowed lawn. Did you have some plans for the site when you purchased it?
Because we don't know zip about construction of retaining walls, etc. we tried to find some websites that could at least give you some ideas of where to start. This first one is actually from a California nursery. They do recommend some plants, but they are all suitable to California. Las Pilitas Simple erosion control for a hillside or garden slope.(California) Another site from the California government has some more ideas for construction or basic erosion prevention. We realize New York is way different from California, but we couldn't find any sites on controlling erosion in New York. We would definitely recommend that you call in some professionals in site control. If that crevice keeps growing and that bank keeps sliding, you're going to run out of a place for your house.
More Erosion Control Questions
Erosion control plants for steep slope in Austin, TX
April 09, 2007 - I'm interested in finding native plants, either perennials or grasses, that would help control erosion on a fairly steep slope. These plants would be in a park, and volunteers will be watering the pl...
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May 27, 2009 - My home is on a canal to a natural lake in Central Florida (Orlando area). I am wondering if there is a wildflower that I can grow on a 3' high canal bank that is mostly shady.
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Native plants for eroding hillside in Kansas
May 08, 2009 - We have a creek running thru our property and the hill running down to it is about 30 feet tall, in some places almost straight down, some sloping. Some is in shade, some full sun. We would like som...
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Native grasses for erosion control in Harlingen, TX
March 12, 2009 - I like to know what type of fast growing grass, ground cover or trees I can put on a slope for erosion control in Harlingen Texas the slope receives afternoon Sun
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Plants for banks of a retention pond in Alabama
April 24, 2009 - What can we plant on the inner and out walls of a detention pond to stop erosion? The pond is located in a neighborhood in Mobile, AL and the walls are 9 ft high with a steep slope.
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