What Weeds Tell About Your Landscape

What Weeds Tell About Your Landscape

By: Mary H. Dyer,
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By Mary H. Dyer, Master Naturalist and Master Gardener

Ralph Waldo Emerson said that weeds are simply plants whose virtues have not yet been discovered. Unfortunately, it may be difficult to appreciate the virtues of weeds when the pesky plants are getting the upper hand in your garden or flower bed. It’s true though, that getting familiar with weeds can help you improve growing conditions in your garden.

So what do weeds tell you about your soil? Read on to learn about weed soil indicators and soil conditions for weeds.

Soil Conditions for Weeds Growing in Your Garden

Several weeds like different growing conditions and are not strictly limited to one certain soil type. Here are the most common soil conditions for weeds:

Alkaline soil – Soil with a pH higher than 7.0 is considered to be alkaline, also known as “sweet” soil. Soil in dry desert climates tends to be highly alkaline. Plants common in include:

  • Goosefoot
  • Stinkweed

Sulphur is often the solution for highly alkaline soil.

Acidic soil – Acidic, or “sour” soil, occurs when soil pH is below 7.0. is common in the Pacific Northwest and other rainy climates. Weed soil indicators for acidic conditions include:

Lime, oyster shells or are often used to remediate acidic soil.

Clay soil – Weeds are actually beneficial in because the long roots create spaces for water and air to penetrate the soil. Weeds often found in clay soil, which tends to be highly alkaline, include:

Changing clay soil is difficult and attempting to improve conditions can make matters worse. However, amendments of coarse sand and compost may help.

Sandy soil – is lightweight and easy to work with, but because it drains so quickly, it does a poor job of retaining water and nutrients. Digging in compost or other , such as leaves, straw or shredded bark, can improve fertility and increase the soil’s capacity to hold water and nutrients. Weed soil indicators for sandy soil include:

Compacted soil – Also known as hardpan, may be the result of excessive foot or vehicle traffic, especially when the ground is wet. Generous amounts of compost, leaves, manure or other organic material can improve soil texture and increase oxygen levels. Weed soil types that grow in rock-hard ground include:

  • Shepherd’s purse

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