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Vertdure

Diagnose your lawn

Identifying the most common weeds and the methods of preventing or controlling their presence

Entretien-pelouse-Traitement-gazon-Québec-Vertdure

Possible causes

Possible causes:

The presence of weeds in a lawn is generally the result of an underlying problem such as a lack of density, acidic or overly compact soil, grass that is cut too short, inadequate fertilization or damage caused by insects or disease. A few weeds in a lawn do not endanger its survival, but a dense weed population requires intervention or the grass will gradually disappear.
This is why it’s important to maintain your lawn’s density and vibrancy through a balanced fertilization programme and good lawn care practices such as:

  • Mowing to a length of 6-8 cm
  • Generous watering
  • Aerating when necessary
  • Adjusting the pH level if the soil is acidic or alkaline
  • Seeding bare or sparse patches
modal
  • Crabgrass

    Problems

    Annual grasses whose leaves are light green in early to mid-summer and burgundy in late summer.

    Period: Starts early in the spring and remains until the end of the summer.

    Solutions

    Preventive measures:

    While crabgrass is producing seeds, mow short and remove clippings.  Later, mow longer.

    Control methods:

    Pull up plants by hand.

    Seed lawn in order to increase its density.

    Since crabgrass is a grass like lawn, it cannot be controlled using conventional herbicides.

  • Quitch grass

    Problems

    Perennial grass that spreads through an underground root system. Its leaves are light green, rough, and wide.

    Period: Throughout the growing season.

    Solutions

    Preventive measures:

    Quitch grass plants cannot be removed by hand because if their roots are torn, other plants will grow in the lawn.

    Use balanced fertilization methods to maintain a dense lawn.

    Mow your lawn to a length of 6 to 8 cm.

    Seed abundantly.

  • Dandelions

    Problems

    Broad-leafed perennial plant that produces yellow flowers, then white balls containing seeds that are spread by the wind.

    Period:

    Throughout the growing season, but the yellow flowers appear in late spring and late summer.

    Solutions

    Preventive measures:

    Increase mowing length.

    Use fertilization to maintain good lawn density.

    Control methods:

    Dandelions can be pulled up by hand (several tools used for quick and effective removal of dandelions are available in gardening and hardware stores). Be sure to remove at least 2/3 of the root system.

    Local applications of herbicide can also be used to control a dandelion infestation.

  • White clover

    Problems

    Broad-leafed (three leaflets) perennial plant from the legume family.  White clover is not considered to be a weed and more and more people introduce it to their lawn on purpose.

    Period: Throughout the growing season.

    Solutions

    Preventive measures:

    Use balanced fertilizing methods.

    Control insects and diseases.

    Seed bare patches.

    Control methods:

    Local applications of herbicide can also be used to control a white clover infestation.

  • Yellow wood sorrel

    Problems

    Perennial plant with distinct heart-shaped leaves and small yellow flowers.

    Period: Late June and July.

    Solutions

    Preventive measures:

    Aerate.

    Control insects and diseases.

    Water generously and less often.

    Seed.

    Control methods:

    Pull up plants by hand.

    It is difficult to control yellow wood sorrel using conventional herbicides.

  • Common plantain

    Problems

    Perennial plant that produces large leaves and many seeds.

    Period: Throughout the growing season.

    Solutions

    Preventive measures:

    Aerate

    Seed with grass seed that can resist long periods of shade.

    Check soil acidity because plantain prefers alkaline soil (pH>8).

    Control methods:

    Pull up plants by hand.

    Local applications of herbicide can also be used to control a plantain infestation.

  • Ground ivy

    Problems

    Perennial plant with round, lobed leaves. It spreads through an above-ground root system. Its stem is square. Ground ivy produces small blue to purple flowers.

    Period: Throughout the growing season.

    Solutions

    Preventive measures:

    Maintain lawn density through balanced fertilization and proper mowing.

    Control methods:

    Ground ivy is difficult to control using conventional herbicides.

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