After a long Canadian winter, your trees are waking up, and just like us, they could use a boost to get back to full strength. Spring is the perfect time to support your trees with proper fertilization, setting them up for strong growth, vibrant foliage, and improved resistance to pests and diseases.
Why Fertilize Your Trees?
Urban trees often grow in soils that are less than ideal. In nature, fallen leaves and organic material naturally recycle nutrients into the soil. But in our yards, we clean that up, removing the natural source of nourishment. Over time, this can lead to nutrient deficiencies, compacted soil, and slow or stressed tree growth.
Fertilization replenishes those missing nutrients, helping your trees:
- Promote vigorous root and canopy growth
- Recover from winter stress
- Improve resistance to pests, diseases, and drought
- Enhance overall vitality and appearance
Tree fertilizers typically contain a mix of:
- Nitrogen (N): For leafy growth and overall vigor
- Phosphorus (P): Supports root development and flowering
- Potassium (K): Boosts disease resistance and water regulation
- Micronutrients like iron, manganese, and magnesium can also be important, especially if your soil is lacking
A soil test can help determine exactly what your trees need. Without it, fertilizing is a bit like taking vitamins without knowing what you’re missing.
How and When to Fertilize
In Southern Ontario, early to mid-spring is an ideal time to fertilize. The soil is thawed, moisture levels are good, and trees are just beginning active growth.
Common fertilization methods:
Deep Root Fertilization
This method injects liquid nutrients directly into the root zone, allowing for fast and efficient absorption. It also helps aerate compacted soils, a bonus for urban trees.
Slow-Release Fertilizer
Granular fertilizers are spread over the root zone and break down over time, feeding your tree gradually throughout the growing season.
Compost Tea
An excellent option for environmentally conscious homeowners, compost and other natural ingredient blends improve soil structure while feeding your trees. Check out our video on compost tea: https://maplehilltree.com/resources/what-are-compost-tea-mulch/
Common Mistakes to Avoid
- Over-fertilizing: More isn’t better, it can burn roots or cause imbalanced growth
- Fertilizing stressed or diseased trees improperly: They may need a different care approach before nutrients can help
- Ignoring soil conditions: Compacted or poorly drained soil can limit nutrient uptake, no matter how much fertilizer you apply
Give Your Trees a Strong Start
Just like people, trees thrive when they have the right nutrition, environment, and care. Spring fertilization is one of the best ways to invest in the long-term health and beauty of your landscape.
Our team of ISA Certified Arborists and Plant Health Care Specialists can help assess your soil, choose the right fertilization plan, and deliver it with precision and care.
Book Your Spring Fertilization Today!
Let’s help your trees wake up happy and healthy this spring.
