Earth-Friendly Landscaping

Earth-Friendly Landscaping

Whether you are starting from a grass lawn or have existing natural areas on your property, the Conservation@Home program can help you make your yard more attractive to wildlife and retain precious rainwater. Steps you can take include planting native plants that support butterflies and other pollinators, installing a rain garden, rain barrel, and/or composter, and removing plants introduced from Europe and Asia. Not only will you be contributing to a healthier environment, but you’ll also get to enjoy a functioning yard with fewer problems and less effort while observing nature’s ever-changing cast of characters right outside your window.

Why Native plants

At the core of environmentally friendly landscapes is the use of native plants, the absence of fertilizers or pesticides, and smart water use. Native plants are those species that have evolved over thousands of years to survive the soils and seasonal conditions of cold, rain, and drought of our northern Illinois climate. Our local native wildlife evolved along with these plants to utilize them as food sources, host plants for reproduction, and crucial habitat.

As Europeans colonized the area, more and more land was converted from native landscape to farm fields, cities, roads, and suburban development. Plants that have historically been planted as replacements have been introduced from outside our local region – usually from Europe or Asia. This has broken the dependent relationships that evolved over thousands of years between native plants and the birds and animals that are dependent on them directly or indirectly for their survival.

For example, today less than 0.01% of native prairie is left in Illinois of what was seen in the early to mid-1800s. The decline of many species of birds and butterflies in our gardens are directly linked to these changes. 

Loss of open spaces and wildlife habitat, degradation of what remains, and polluted stormwater runoff are the leading causes of environmental problems in our developed areas. If we can replace some of this lost habitat in our yards and conserve rainwater before it runs into our roads, then we can reduce some of the negative impacts of development as well as climate change, have cleaner water in our neighborhoods, and enjoy a better quality of life.

We will also be restoring the food sources (in the form of native plants) that have been lost to our pollinators as land has been developed over the past 200 years. This single act of adding native plants – including trees and shrubs – to our gardens will significantly help make our gardens not only beautiful but productive and full of life!

What is a Native Plant?

Native plants are typically defined as those trees, shrubs, wildflowers and grasses that evolved over thousands of years to our climate and soils. The assemblage of plants that evolved together in a particular place with certain light, soil, and water conditions is called an ecosystem. These can be largely treeless (prairie or wetland) or have differing densities of trees (savannah, woodland, forest.)   

Monarch butterfly sits atop a blazing star, a native flower

Choosing the Right Native Plants For Your Yard

In choosing natives to plant in your gardens, your best chance of success is first to generally match the soil, water and light conditions of the native plants in your garden according to where the plants grew historically, and second to buy plants whose genetics are from within your region.

For example, if your garden gets more than 6 hours of sun a day, the best plants to look at are those that are considered prairie species. If you were to choose Little Bluestem (Schizachyrium scoparium) to add to your garden – a beautiful native grass – try to purchase plants whose genetics are from northern/north central Illinois, southern Wisconsin or northern Indiana. Little Bluestem from the Great Plains would have different evolutionary history and different genetics, and might not grow as well (or too aggressively) in your garden. If you have more shade on your property, native plants that grow in woodlands are a better match. 

You can find a list of local nurseries that carry native plants iour Nurseries & Professional Resources section.

What About Native Plant Cultivars or Nativars?

The world of native plant selections can be very confusing to the home gardener. As the popularity of native plants has increased, many growers have increasingly developed selections of native species that have been genetically modified to meet certain characteristics. These are called cultivars or nativars.
Diagram of native prairie plants of Illinois
Image created by The Conservation Foundation, using source information from the Conservation Research Institute.

The Benefits of Deep Roots

Most of Illinois’ native plants boast deep and dense root systems that can help you improve the soil in your yard as well as save you money. A few benefits to incorporating native plants with deep roots into your garden: 

  • No need to water your plants (once established)! They thrive on rainwater since they can store it several feet underground.  This has the dual benefit of soaking up rainwater and getting it away from the surface so you don’t have puddling occurring and being able to store that water deep in the soil, so it has something to drink during drought times (saving you money on your water bill!). 
  • Filter out pollutants from water. The root systems of native plants serve as natural filters that effectively trap sediments and absorb excess nutrients and pollutants, which in turn safeguards our local watershed.  
  • Reduce erosion. Those nice dense root systems hang on to soil and keep it in place. As you can see in the image above, turf grass only has a few inches of roots, which don’t cling on to soil very well. Whether you have a pond or an area where your downspout or sump pump run off tends to wear away the soil, native plants will help to keep from soil eroding away. 
  • Loosens and improves soil. A good amount of the soil around the Chicagoland area is clay. If that clay has been stuck underneath turf grass for a long time, those short roots have not allowed for moisture to seep in past a few inches from the surface, which makes the clay hard as a rock to dig into when trying to plant a garden. Native plants evolved here which means a good amount of them have no problem growing in clay. As they continue to grow, they can work their roots into that rock hard clay and start to loosen it up, creating nice little nooks and crannies for moisture to get in. In turn, this creates a perfect environment for microorganisms and insects to thrive. Soil is a living, breathing thing – dirt is dead! 

Solving Problems with Native Plants

Helpful Tips

Many people who want to include natives are reluctant to add plants that will make a garden look “messy,” but there are numerous examples in our area where native landscaping is a resounding success. There are hundreds of homes we have visited and certified over the years as part of our Conservation@Home program that are helping to add back lost habitat through their native gardens. The butterfly garden planted in front of The Conservation Foundation’s office is an example of Conservation@Home.

Careful selection of the native plants you want to add, done exactly as would be done with other plants you purchase, will help you succeed and we are here to help!  With the right selections, you can easily incorporate native plants into existing or new gardens and create beautiful oases of life. Here are some helpful hints to consider.

  • As with any plant you add to your garden, choose species that generally match the growing conditions of your location.
  • Purchase native plants from a reputable grower that does not dig wild plants. Also make sure that the plant’s genetics are from regional sources.
  • Think about the mature height of the plant and, unless you have a larger area, generally choose native perennials and grasses that grow to less than 3-4 feet high. There are places to use taller native species but often their effect is not as successful in a smaller residential garden.
  • Plant into the existing soil. Native plants do not need fertilizers or other soil amendments.  Soil that is too rich will cause overgrowth of some species and they will look unattractive.
  • If you live in a relatively new development that had most of the topsoil removed during development and are trying to dig in heavy clay, mix in some leaf mulch. You don’t need much though; we suggest a 20:80 mulch to soil ratio.
  • Turning soil over as part of the mixing process will often expose weed seeds. Be prepared and watch so you can get an early handle on controlling them.
  • Hand pull weeds to keep them in check and remove competition for light and water.
  • Mulch your new planting area to help keep unwanted weed growth down. It is best to use a leaf mulch rather than wood chips in a perennial garden. If using wood chips, make sure they are aged and shredded.
  • It’s fine to cut back most native plants if you think they get too large for the garden. This works most successfully with native plants that bloom later in the summer and fall.  Cut them back to 6-8” in late May or early June.  They will come back fuller and will flower at a shorter height.
  • Since many butterflies and other pollinators overwinter in leaf duff, hollow stems or in the ground it is better to wait on cleaning up the garden until spring when the weather warms. Leaving some flower heads and tall grasses also adds a nice dimension to the winter landscape and provides seeds and protection for birds and other species. The chrysalis of the Clearwing Hummingbird Moth that overwinters in leaf litter is a good example.
  • Some, but not all, native plants spread easily by seed if there is a lot of bare ground in your garden. If you do not want them to spread to other parts of the garden, cut off the seed heads or pods and dispose of them before they ripen.

Invasive plants

A plant becomes invasive by being able to grow successfully and out-compete other plant species for water, nutrients and sunlight.  Typically this happens because they have been taken out of their natural environment (Europe and Asia in the case of buckthorn) and now have no natural controls.  An introduced species may only become invasive over time, and some, such as Hosta, never do.

How does a plant become invasive?

Characteristics that increase the risk of an introduced species becoming invasive include their ability to grow quickly, to be adapted to a broad range of soil and light conditions, and to be prolific seed producers.  Another good example of this that is a terrible problem in the southeastern U.S., is Kudzu (Pueraria montana var. lobata). Deliberately introduced from Asia to control erosion, it is now overgrowing virtually everything.  Its presence has been reported in a number of counties in southern Illinois and there has been one report from Evanston, IL. 

Buckthorn is spread by birds who eat the fruit that has a cathartic effect.  The Kudzu, a climbing vine, can grow up to 100 feet in one season.

Common Buckthorn

Back in the mid-1800s when Common Buckthorn (Rhamnus cathartica) was first introduced in the U.S. as a hedge plant, no one had any idea it would become one of the worst invasive species in the Chicago region.  Today it comprises 40% of the canopy cover included under the Chicago Region Trees Initiative. “So what?” you might say.  Well, the problems caused by this plant invasion are typical of those caused by any other plant species that is included under this category. 

Why are invasive plants a negative thing?

First, and most importantly, since our moths, butterflies, native bees, etc. did not evolve with an introduced plant from another continent, that plant is not an equivalent food source for these critters.  Since plants are at the bottom of the food chain, the bugs that depend on them are fewer because there is less food, as are the birds that depend on the bugs and so on. 

Now, you might see a butterfly sipping nectar (or at least looking for it) on a flowering plant that originated in China – Astilbe for instance –  but chances are good that the plant does not provide food for the caterpillar or a home for a chrysalis. 

Secondly, as an invasive species outcompetes our native plants in natural areas, the natives there slowly disappear as they are displaced or unable to survive in lower shade and soil moisture conditions.  In the case of Common Buckthorn, all the native plants in the ground plane are unable to survive.  As they die out, the ground under them becomes a food desert.  As added insult, Common Buckthorn doesn’t provide a nutritious meal either!

This is a simplified explanation of what happens, but this is what generally follows the invasion of any introduced species into our valuable natural areas.  They may not currently be as problematic as Common Buckthorn but you don’t always know when a plant is going to become more problematic.  This is why ecologists worry anytime they see any plant that doesn’t belong in our woodlands, prairies and wetlands.

Healthy Soil, Healthy Lawns

Make simple lawn care choices to manage your yard that are more healthy for you, your community and the environment.  

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