Native Plants
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Sunday - June 21, 2009
From: Lake Forest, IL
Region: Midwest
Topic: Water Gardens
Title: Understory plants for Lake Forest IL
Answered by: Barbara Medford
QUESTION:
We have a large mostly hardwood lot in Lake County. It floods when it rains hard and remains damp most of the year due to the amount of shade and clay based top soil. Besides the hardwood trees and a few spruce trees the undergrowth appears to mostly ferns, some non-native monkey grass and some other ground cover. What flowering bushes or flowers would be good to add to the lot as there is a lot of open bare ground? Something that would also be a food source to birds and animals would be of interest as well.ANSWER:
A shady, wet environment is going to call for some ingenuity and maybe some work, before you plant anything. The clay soil and hard rains are two strikes against most plants. The first thing you need to do is assess the drainage. Where does water stand the longest? Are there any barriers (natural or otherwise) that could be moved to permit better drainage? When you are ready to commit to planting in certain areas, you need to do everything you can to improve the drainage there. The first, best move is to work a lot of compost or other oganic material (not peat moss, please) into the selected areas. Compost is like a wonder drug; it adds nutrients to the soil, it helps make trace minerals in the soil available to the plant roots and, most important, it keeps the roots from drowning because of water standing on them. Raised beds are another possibility; read this article from Popular Mechanics magazine, How to Build and Install Raised Garden Beds.
The next criteria you need to consider before you select plants is the amount of sun available to each area you have designated for planting. The plants in our Native Plant Database are all categorized as to their tolerance of sun (6 or more hours of sun a day), part shade (2 to 6 hours of sun) and shade (less than 2 hours of sun). It would be very useful for you to make a daily or weekly record of how long the sun is on each of your prospective planting areas. This will change slightly, of course, through the seasons as the position of the sun and the length of daylight change.
As you can see, selecting plants is not the first step, but the last in a situation like this. Start out by reading this About.com website Fighting Drainage Problems by Landscaping with Native Plants. The plants listed are not all necessarily native to your area, but it does refer to the Northeast United States, so many of them could be. Have you considered creating a pond area in your landscaping to handle some of the drainage? From previous answers by Mr. Smarty Plants, we found some answers on screening plants around a pond in Illinois. The situation was somewhat different, but the plants would still apply. Construction of a pond is way out of our comfort zone, but take a look at this University of Virginia Cooperative Extension website on Pond Construction: Some Practical Considerations.
At last, some plant suggestions. You can go to our Recommended Species site, click on Illinois on the map, and then Narrow Your Search by looking for plants that can take shade (and you can check both shade and part shade) and wet soil. Start out by searching on herbs (herbaceous blooming plants) under Habit, and then you can search on shrubs, ferns or grasses. We are going to make a couple suggestions from each category, and you can expand on that. You should note the soil requirements, if the plant will tolerate clay, if it needs acid or alkaline soil and so forth. Because you are interested in attracting wildlife, you want to select plants that are either larval hosts or nectar sources for bees and butterflies, have berries or provide shelter and nesting materials. For some more tips on wildlife gardening, read our How-To Article on Wildlife Gardening. On the list below, follow the plant link to the webpage on that plant to find out the wildlife benefits and other features.
Herbaceous flowering plants for Illinois
Asclepias incarnata (swamp milkweed) - blooms pink, purple June to October, sun or part shade
Lobelia cardinalis (cardinalflower) - blooms red May to October, sun, part shade or shade
Shrubs for Illinois
Cephalanthus occidentalis (common buttonbush) - evergreen, blooms white, pink June to September, part shade or shade
Viburnum opulus var. americanum (American cranberrybush) - blooms white May to October, part shade
Grass, grass-like plants for Illinois
Calamagrostis canadensis (bluejoint) - sun, part shade or shade
Typha latifolia (broadleaf cattail) - evergreen, sun or part shade
Ferns for Illinois
Athyrium filix-femina (common ladyfern) - part shade or shade
Osmunda cinnamomea (cinnamon fern) - sun, part shade or shade
More Water Gardens Questions
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April 20, 2011 - We have a small run off from one pond to another. At the bottom of the slope, the area is always wet--and not from the run off. Is there a low growing plant that would provide a root system to help st...
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Plant ID at the Wildflower Center from Austin
June 18, 2012 - I was at the Wildflower Center today and loved the green plants with delicate white flowers that were in both clay pots in front of the auditorium. Please let me know the name of the plants.
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Effect of herbicides on frogs
December 10, 2007 - I live in a planned development adjacent to a natural waterway that contains native and non native plants. It also is an amphibian habitat with many frogs.
The landscape manager has sprayed the ar...
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The origin of Juncus effusus var. Big Twister
May 04, 2008 - Juncus effusus, var. 'Big Twister' We're trying to figure out the nativity of this thing, and whether it is safe to plant in our very wet rain garden. Thank you for any assistance...
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Plants for a pond bank in NE Pennsylvania
January 13, 2011 - I had a 3/4 acre pond built this fall in Northeastern Pennsylvania (Susquehanna county; zone 4). The pond banks are packed, hard rocky clay. What plants can I plant in the 3 foot bank between pond ...
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