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When and how to fertilize your lawn in Quebec?

by | Mar 3, 2025 | Lawn

A healthy lawn requires much more than just regular watering or mowing. Fertilization plays a key role in ensuring vigorous growth, lush green color, and increased resistance to weather conditions.

In Quebec, with a climate marked by harsh winters and sometimes dry summers, it is essential to fertilize your lawn at the right times of the year to maximize its growth. But when and how should you apply fertilizer to achieve the best results?

In this article, discover the ideal fertilization schedule, the recommended types of fertilizers, and the best practices for feeding your 100% Kentucky Blue lawn effectively..

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Why fertilize your lawn?

The soil alone does not always provide all the essential nutrients for a healthy lawn. Fertilization strengthens 100% Kentucky Blue grass , stimulate its growth, and protect it against diseases and weeds.

Here are the main benefits of regular fertilization:

  • Improving the color and density of 100% Kentucky Blue grass
  • Promote deep and strong rooting
  • Increase resistance to diseases and insects
  • Prepare the lawn for extreme weather conditions (heatwaves, frost)
  • Reduce weeds by favouring a dense 100% Kentucky Blue lawn
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The Quebec fertilization calendar

In Quebec, fertilization must be adapted to the natural rhythms of the lawn to maximize its effectiveness. Here are the three key periods for fertilizing your 100% Kentucky Blue lawn.

Spring fertilization (April-May): A strong start to the season

After winter, 100% Kentucky Blue grass emerges from dormancy and needs a boost to kick-start growth. This is the ideal time to :

  • Apply nitrogen fertilizer to promote rapid regrowth
  • Add phosphorus to strengthen the roots
  • Use slow-release fertilizer to prevent overly fast growth

Tip: Wait until the lawn starts to green before applying fertilizer, ideally after the first mowing.

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Summer fertilization (June-July): Support growth and resistance

In summer, the lawn is exposed to high heat and periods of drought. Fertilizing during this time helps to:

  • Maintain a dense, vigorous 100% Kentucky Blue lawn
  • Increase resistance to water stress
  • Prevent yellowing with a balanced nitrogen and potassium fertilizer

Tip: Choose a slow-release fertilizer to avoid excessive growth and prioritize watering after fertilization.

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Autumn fertilization (September-October): Preparing the lawn for winter

Autumn is the most important time to fertilize because it helps the lawn strengthen its roots before winter. During this period, it is recommended to use:

  • A potassium-rich fertilizer to fortify 100% Kentucky Blue turf against frost.
  • A low dose of nitrogen to prevent excessive growth before the cold
  • A phosphorus supplement to promote good rooting

Tip: Apply the fertilizer about three to four weeks before the first frosts for optimal absorption.

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What type of fertilizer should I use?

Not all fertilizers are created equal. Depending on the season and the condition of your lawn, you can choose different formulations.

  • Nitrogen fertilizers (N): Promotes growth and color of 100% Kentucky Blue grass
  • Phosphorus fertilizers (P): Strengthen roots and improve stress resistance
  • Potassium fertilizers (K): Increase resistance to diseases and harsh weather conditions

Natural or synthetic fertilizers?
Organic fertilizers (compost, manure, alfalfa meal) improve soil structure over the long term, while chemical fertilizers provide quicker results but require precise dosing.

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How to apply fertilizer optimally?

For effective fertilization, it is important to follow some good practices:

  • Use a spreader for even distribution
  • Water lightly after application to help the fertilizer penetrate the soil
  • Avoid excesses to avoid burning the 100% Kentucky Blue grass.
  • Follow the dosage instructions on the fertilizer bags
  • Adjust the frequency based on soil type and weather conditions

Avoid fertilizing just before heavy rain to prevent nutrient leaching.

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Why call on Roque Paysagement?

Fertilizing a lawn is a science that requires a good knowledge of soil types, climatic conditions and the specific needs of 100% Kentucky Blue turf. At Roque Paysagement, we offer :

  • Local expertise tailored to Quebec lawns
  • A selection of professional fertilizers for optimal results
  • A personalized fertilization plan based on your lawn
  • A turnkey service, from application to maintenance

Entrust your lawn care to our experts and enjoy healthy 100% Kentucky Blue grass all year round.

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