Native Plant Root Systems

The deep root systems of many Wisconsin native plants increase the soil’s capacity to stabilize soils, reduce water usage, control water runoff and, consequently, reduce flooding.

Chart showing depth catalog of native plant roots.
Native Plants Have Deep Roots

The roots of a plant play an important role to help the plant grow and thrive. They anchor the plant in the soil; absorb water and minerals; and store excess food for future needs underground. We are all familiar with eatable roots like carrots, beets parsnips and potatoes. What about the roots of native and wild plants? What are their attributes? Do they provide food and medicine?

The bulk of a prairie grass plant, it turns out, exists out of sight, with anywhere from 8 to 14 feet of roots extending down into the earth. Why should we care? Besides being impressively large, these hidden root balls accomplish a lot:

  Nourishing soil
  Increasing bioproductivity
  Preventing erosion

One of the really nice things about bringing native plants back into our environments is that they are already acclimated to our local soils, rainfall and nutrient loads. Garden soils need little work for native plants to flourish.

  Root Physiology

Primary root tissues.
Primary Root Tissues

The roots of plants have four regions: (1) a root cap; (2) a zone of division; (3) a zone of elongation; and (4) a zone of maturation.

The root cap is a cup-shaped group of cells at the tip of the root which protects the delicate cells behind the cap as it pushes through the soil. The root cap secretes mucigel, a substance that acts as a lubricant to aid in its movement. The root cap also plays a role in a plant’s response to gravity. If you were to place a young plant on its side the stem would grow upward toward the light and the root cap would direct the roots downward.

The root cap firmly drives the roots downward in most plants. So strong and persistent is this mechanism that roots has been known to break through rock, concrete and other hard surfaces. Some scientists also believe that the downward direction of the root may also be that the plant is trying to escape the sun’s radiation.

Above the root cap is the zone of division and above that is the zone of elongation.

Primary root ares.
Primary Root Zone
of Elongation

The zone of division contains growing and dividing meristematic cells. As we learned last time the meristem cells are very important to the design and function of a plant, they hold the DNA of the plant and create new cells for the expansion of the plant. If something damages the meristem cells the plant will either die or be deformed.

After each cell division, one daughter cell retains the properties of the meristem cell, while the other daughter cell (in the zone of elongation) elongates sometimes up to as much as 150 times. As a result, the root tip is literally pushed through the soil.

In the zone of maturation, cells differentiate and serve such functions as protection, storage, and conductance. Seen in cross section, the zone of maturation of many roots has an outer layer (the epidermis), a deeper level (the cortex), and a central region that includes the conducting vascular tissue.

  Roots and Plant Growth

The root of a plant provides a significant competitive edge to a plant trying to reach light. The root of a plant such as a tree provides an anchor and base as the tree stretches to the top of the forest. In general, the deeper the root and wider it’s base, the larger the plant.

We all have experienced the stunting of plant growth when a root has not the right soil to anchor in. The tilth and depth of the soil is important to healthy roots.

The leaves of a plant act to channel rainfall and water to the roots which in turn absorbs it and distributes it inside the plant. The root is also very good at uptaking toxins and heavy metals. This is why plants are so good and helping to clean up the earth. This process is called bioremediation. This intense uptake can also make eating roots and plants dangerous to human health. That is why it is such a good idea to grow your own food or only purchase organically grown food. For instance potatoes grown in the toxic fields of commercial chemical farms are very contaminated.

  The Roots of Old

Roots of Native Plants

The roots of native plants can be extremely beneficial to human health. First peoples referred to any part of a plant growing underground as a root. Bulbs, corms, tubers and rhizomes are often lumped into the family of roots. The term root crop refers to any edible underground plant structure, but many root crops are actually stems, such as potato tubers.

Rhizomes are simply underground stems. They grow horizontally just below the soil’s surface. They will continue to grow and creep along under the surface with lots and lots of growing points.

Examples of rhizomes would be lilies, irises, and asparagus. A corm looks a lot like a bulb but is the actual base for the plant stem and has a solid texture. As the plant grows, the corm shrivels as the nutrients are used up. Essentially the corm dies, but it does produce new corms right next to or above the dead corm. If you look closely at the bottom of the corm, rhizome and bulb you will find true roots.

  Native Plants Are Low Maintenance

Native plants require very little maintenance because they have evolved and adapted natural defenses to local conditions such as drought, nutrient-poor soil, winter conditions, disease and insects which can be problematic to non-native species. This means that natives save residents time and money because they require little or no lawn chemicals and less irrigation than non-native plants.

  Native Plants Reduce Storm Water Runoff

Attractive and easy-to-maintain landscaping features can reduce the amount of runoff from roofs and lawns. Downspouts can be redirected to help irrigators in gardens — shallow depressions planted with native plants specifically adapted to wet conditions. Rain gardens are a great way to help runoff soak into the ground. Another way to improve your property’s ability to absorb runoff is by reducing the amount of turf grass, and replacing it with larger garden beds which include native plants.

A typical lawn absorbs only 10% of the amount of storm water that a natural landscape can absorb.

A typical lawn absorbs only 10% of the amount of storm water that a natural landscape can absorb. Replacing lawns with drought-tolerant native grass is another way to improve drainage and reduce runoff. Most turf grasses are high maintenance, especially during drought conditions, but native buffalo grass is an effective alternative because it is low maintenance, increases infiltration and is drought resistant due to its long roots.

Turf grass roots are 1-2 inches long, while buffalo grass has roots that reach up to 6 feet! When storm water isn’t able to seep into the ground, it runs off onto lawns, sidewalks, driveways and streets, picking up pollutants along the way. Storm water runoff eventually finds its way to storm sewers where it is transported to a nearby stream or lake — untreated.

Common pollutants found in storm water runoff include lawn chemicals, pet waste, household chemicals, oil, and soaps used for car washing. Even small amounts of pollution in storm water runoff can add up to a big problem for lakes, streams, rivers, and even oceans.

More Articles:

 Wisconsin Native Grasses
 Fertilizer Basics: A Tutorial
 Soil Biology
 Soil Health
 Why Are Earthworms Good For The Garden?

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