Lime is often overlooked by lawn owners, but it plays an essential role in soil health. In Quebec, where soils tend to be acidic, adding lime can significantly improve grass growth and fertilizer efficiency.
What is lime?
Lime is a natural amendment, generally composed of crushed limestone, used to reduce soil acidity (increase pH).
Soil that is too acidic prevents the grass from properly absorbing nutrients, even if you fertilize regularly.
Why put lime on your lawn?
Here are the main advantages:
- Corrects overly acidic soil
- Improves fertilizer effectiveness
- Promotes deeper rooting
- Stimulates soil microbial activity
- Helps achieve a denser, healthier lawn
How do you know if your soil needs it?
Before applying lime, it is recommended to do a soil pH test.
Indications of acidic soil:
- Yellowish or weak grass
- Presence of moss
- Poor response to fertilizers
An ideal pH for grass is generally between 6 and 7.
When to apply lime?
The best times are:
- Spring (April to June)
- Fall (September to November), ideal
Avoid periods of frost or high heat.
How to apply lime?
A few simple steps:
- Mow the lawn
- Apply evenly with a spreader
- Water lightly after application
- Avoid combining immediately with certain fertilizers (depending on the type)
It is best to apply in the fall to prepare the soil for spring.
How much to use?
The quantity depends on the pH and soil type (clay, sandy, etc.).
In general:
- Between 2 and 5 kg per 100 m²
A soil test remains the best reference.
Types of lime
- Calcitic lime: the most common
- Dolomitic lime: contains magnesium (useful if the soil is lacking)
Mistakes to avoid
- Applying without a soil test
- Overdosing (can harm the lawn)
- Applying on frozen ground
- Thinking that lime replaces fertilizer
Conclusion
Lime is a simple and effective ally to improve your soil quality and lawn health. When used correctly, it optimizes your maintenance efforts and helps you achieve a greener, denser, and more resistant lawn.
