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 alkaline soil include:
Goosefoot Wild carrot Stinkweed Spurge Chickweed
Sulphur is often the solution for highly alkaline soil. Acidic soil – Acidic, or “sour” soil, occurs when soil pH is below 7.0. Acidic soil is common in the Pacific Northwest and other rainy climates. Weed soil indicators for acidic conditions include:
Stinging nettle Dandelions Purslane Pigweed Knotweed Red sorrel Oxeye daisy Knapweed
Lime, oyster shells, or wood ashes are often used to remediate acidic soil. Clay soil – Weeds are actually beneficial in clay soil 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:
Chicory Wild carrots Canada thistle Milkweed Dandelions
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 – 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 organic material, 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:
Sandbur Bindweed Toadflax Speedwell Carpetweed Nettle
Compacted soil – Also known as hardpan, heavily compacted soil 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 Knotweed Goosegrass Crabgrass
